diff --git a/SourceCode/Code2026/CoreCommand/CoreTools.cpp b/SourceCode/Code2026/CoreCommand/CoreTools.cpp
index 3fb2da2..91fb2a9 100644
--- a/SourceCode/Code2026/CoreCommand/CoreTools.cpp
+++ b/SourceCode/Code2026/CoreCommand/CoreTools.cpp
@@ -20,6 +20,7 @@
 #include "SelectBlkDlg.h"
 #include "gpc.h"
 #include "ImpMD5.h"
+#include "SectionPerfCounter.h"
 #include "breptools.h"
 #include "DimScaleZoneDlg.h"
 #include "simpleProperty.h"
@@ -3113,6 +3114,10 @@ namespace
 
 Adesk::UInt64 CoreTools::RegionToString(const AcDbRegion *pReg, char *& pszTxt)
 {
+	// Phase 0 计数：回写（Region -> SAT 文本）次数
+	SectionPerf::Scope perfScope("CoreTools::RegionToString");
+	SectionPerf::NoteWriteBack("CoreTools::RegionToString");
+
 	Adesk::UInt64 dwFileLength = 0;
 	pszTxt = NULL;
 
@@ -3518,6 +3523,9 @@ bool CoreTools::CurveToString(const AcDbCurve * pCurve, CString & sScr2)
 
 AcDbRegion* CoreTools::StringToRegion(const CString & sRegionScrp)
 {
+	// Phase 0 计数：截面恢复耗时/次数/文本唯一性，见 pipe-section-region-performance-plan.md
+	SectionPerf::Scope perfScope("CoreTools::StringToRegion");
+
 	std::string sUtf8 = CoreTools::unicode2Ansii((LPCTSTR)sRegionScrp, CP_UTF8);
 	std::string sNewSrc;
 	if (!fixACISFormat(sUtf8.c_str(), sUtf8.size(), sNewSrc))
@@ -3538,10 +3546,13 @@ AcDbRegion* CoreTools::StringToRegion(const CString & sRegionScrp)
 	CString sFullPath = MakeTempSatPath();
 	if (sFullPath.IsEmpty()) return NULL;
 
+	SectionPerf::NoteRegionText(sNewSrc.c_str(), sNewSrc.size());
+
 	if (file.Open(sFullPath, CFile::modeCreate | CFile::modeWrite))
 	{
 		file.Write(sNewSrc.c_str(), sizeof(char) * (UINT)sNewSrc.size());
 		file.Close();
+		SectionPerf::NoteTempFile(sNewSrc.size());
 	}
 	else
 	{
@@ -3580,6 +3591,8 @@ AcDbRegion* CoreTools::StringToRegion(const CString & sRegionScrp)
 
 AcDbRegion *CoreTools::StringToRegion(Adesk::UInt64 nLen, char *pszReg)
 {
+	SectionPerf::Scope perfScope("CoreTools::StringToRegion(buf)");
+
 	std::string sNewSrc;
 	if (!fixACISFormat(pszReg, (size_t)nLen, sNewSrc))
 	{
@@ -3597,11 +3610,14 @@ AcDbRegion *CoreTools::StringToRegion(Adesk::UInt64 nLen, char *pszReg)
 	CString sFullPath = MakeTempSatPath();
 	if (sFullPath.IsEmpty()) return NULL;
 
+	SectionPerf::NoteRegionText(sNewSrc.c_str(), sNewSrc.size());
+
 	CFile file;
 	if (file.Open(sFullPath, CFile::modeCreate | CFile::modeWrite))
 	{
 		file.Write(sNewSrc.c_str(), sizeof(char) * (UINT)sNewSrc.size());
 		file.Close();
+		SectionPerf::NoteTempFile(sNewSrc.size());
 	}
 	else
 	{
diff --git a/SourceCode/Code2026/CoreCommand/EarthWorm.cpp b/SourceCode/Code2026/CoreCommand/EarthWorm.cpp
index 7ec11ad..2667419 100644
--- a/SourceCode/Code2026/CoreCommand/EarthWorm.cpp
+++ b/SourceCode/Code2026/CoreCommand/EarthWorm.cpp
@@ -19,6 +19,7 @@
 #include "AecDbPingFaDim.h"
 #include "AecDbDimScaleZone.h"
 #include "AecDbJoggedCamera.h"
+#include "SectionPerfCounter.h"
 
 #include "breptools.h"
 #include "HlrCutOption.h"
@@ -543,6 +544,20 @@ KTDocReactor *g_pDocReactor(NULL);
 #define ADD_CMD(cmd, func) CoreTools::AddCommand(_T("KTEARTHWORMCORE"), _T(#cmd),	_T(#cmd), ACRX_CMD_TRANSPARENT | ACRX_CMD_USEPICKSET, func)
 #define ADD_CMD_EX(cmd, func, flag) CoreTools::AddCommand(_T("KTEARTHWORMCORE"), _T(#cmd),	_T(#cmd), flag, func)
 
+#if defined(_DEBUG)
+// Phase 0：截面恢复计数器。实现见 CoreLibrary/SectionPerfCounter.cpp
+void envierpf_dump()
+{
+	SectionPerf::Dump();
+}
+
+void envierpf_reset()
+{
+	SectionPerf::Reset();
+	acutPrintf(_T("\n[SectionPerf] 已清零。"));
+}
+#endif
+
 void InitApplication()
 {
 #ifdef ZWCAD
@@ -1066,6 +1081,12 @@ void InitApplication()
 	void pzjcs();
 	ADD_CMD(co_pzjcs, pzjcs);
 
+#if defined(_DEBUG)
+	// Phase 0：截面恢复计数器（仅 Debug，且需启动前设 AEC_PERF_COUNTER=1）
+	ADD_CMD(ENVIPERFDUMP, envierpf_dump);
+	ADD_CMD(ENVIPERFRESET, envierpf_reset);
+#endif
+
 #pragma endregion
 
 	if (CKTCadUtility::SetSystemVar(_T("STATUSBARAUTOWRAP"), 0))
diff --git a/SourceCode/Code2026/CoreLibrary/AecDbEwPipeBase.cpp b/SourceCode/Code2026/CoreLibrary/AecDbEwPipeBase.cpp
index d0e4578..f38d72d 100644
--- a/SourceCode/Code2026/CoreLibrary/AecDbEwPipeBase.cpp
+++ b/SourceCode/Code2026/CoreLibrary/AecDbEwPipeBase.cpp
@@ -18,6 +18,7 @@
 #include "GiDrawUtility.h"
 #include "AcGiViewDraw.h"
 #include "AcDbX3dSolid.h"
+#include "SectionPerfCounter.h"
 
 #ifndef EW_EARTHWORMINIT
 #define EW_EARTHWORMINIT _T("EW_EARTHWORMINIT")
@@ -793,6 +794,9 @@ AcDbRegion *AecDbEwPipeBase::RegionFromCurvesDwgInFields(AcDbDwgFiler *pFiler, A
 
 AcDbRegion* AecDbEwPipeBase::RegionAcisInDwgInFields(AcDbDwgFiler* pFiler)
 {
+	// Phase 0 计数：截面恢复耗时/次数，见 pipe-section-region-performance-plan.md
+	SectionPerf::Scope perfScope("EwPipe::RegionAcisIn");
+
 	//高版本acis方式
 	CString sFileName;
 	TCHAR* pszFileName = NULL;
@@ -816,6 +820,9 @@ AcDbRegion* AecDbEwPipeBase::RegionAcisInDwgInFields(AcDbDwgFiler* pFiler)
 	::memset(pszTxt, 0, nLen + 1);
 	pFiler->readBytes(pszTxt,nLen);
 
+	// 同一份 SAT 文本被恢复多少次：唯一 hash 数 / 模拟命中率
+	SectionPerf::NoteRegionText(pszTxt, (size_t)nLen);
+
 	if (sFileName.CompareNoCase(_T("errorfile")) == 0)
 	{
 		//原生写法
@@ -854,6 +861,9 @@ AcDbRegion* AecDbEwPipeBase::RegionAcisInDwgInFields(AcDbDwgFiler* pFiler)
 	file.Close();
 	delete[] pszTxt;
 
+	// 读侧落盘的临时文件次数/字节（杀软扫描影响面）
+	SectionPerf::NoteTempFile((size_t)nLen);
+
 	AcDbVoidPtrArray arBodyPtrs;
 	Acad::ErrorStatus es = AcDbBody::acisIn(sFullPath,arBodyPtrs);
 	if (es != Acad::eOk)
@@ -1196,6 +1206,10 @@ Acad::ErrorStatus AecDbEwPipeBase::BaseCurveDwgOutFields(AcDbCurve* pBaseCurve,A
 
 Acad::ErrorStatus AecDbEwPipeBase::RegionAcisoutDwgOutFields(AcDbDwgFiler* pFiler) const
 {
+	// Phase 0 计数：回写（Region -> SAT 文本）的次数与耗时
+	SectionPerf::Scope perfScope("EwPipe::RegionAcisout");
+	SectionPerf::NoteWriteBack("EwPipe::RegionAcisout");
+
 	if (m_pRegion == NULL)
 		return Acad::eInvalidInput;
 
@@ -1251,6 +1265,9 @@ Acad::ErrorStatus AecDbEwPipeBase::RegionAcisoutDwgOutFields(AcDbDwgFiler* pFile
 	ULONGLONG dwFileLength = file.GetLength();
 	Adesk::UInt32 nLen = (Adesk::UInt32)dwFileLength;
 
+	// acisOut 写出来的临时文件（回写侧的落盘量）
+	SectionPerf::NoteTempFile((size_t)nLen);
+
 	char* pszTxt = new char[nLen + 1];
 	::memset(pszTxt, 0, nLen + 1);
 
diff --git a/SourceCode/Code2026/CoreLibrary/SectionPerfCounter.cpp b/SourceCode/Code2026/CoreLibrary/SectionPerfCounter.cpp
new file mode 100644
index 0000000..d8309ea
--- /dev/null
+++ b/SourceCode/Code2026/CoreLibrary/SectionPerfCounter.cpp
@@ -0,0 +1,281 @@
+#include "stdafx.h"
+#include "SectionPerfCounter.h"
+
+#include <windows.h>
+#include <stdlib.h>
+#include <string>
+#include <map>
+#include <set>
+
+namespace
+{
+	// 单个计数器：次数 + 累计耗时（µs）
+	struct Entry
+	{
+		Entry() : nCount(0), nTotalUs(0), nMaxUs(0) {}
+
+		unsigned long long nCount;
+		unsigned long long nTotalUs;
+		unsigned long long nMaxUs;
+	};
+
+	// 唯一 hash 表的上限：正常图纸几十到几百个唯一截面，
+	// 万一文本各不相同（说明缓存没意义）也不让内存无限涨
+	const size_t kMaxUniqueHash = 50000;
+
+	struct Stats
+	{
+		Stats()
+			: bInited(false), bEnabled(false)
+			, nRegionTexts(0), nUniqueHashes(0), nSimulatedHits(0), bHashTableOverflow(false)
+			, nTempFiles(0), nTempFileBytes(0)
+			, nWriteBacks(0)
+		{
+		}
+
+		bool bInited;
+		bool bEnabled;
+
+		std::map<std::string, Entry> entries;   // tag -> 次数/耗时
+
+		unsigned long long nRegionTexts;        // 一共恢复过多少份 SAT 文本
+		size_t             nUniqueHashes;       // 其中不同内容有多少
+		unsigned long long nSimulatedHits;      // 若做内容缓存，能命中多少次
+		bool               bHashTableOverflow;
+
+		std::set<unsigned long long> hashSeen;
+
+		unsigned long long nTempFiles;          // 临时文件写入次数
+		unsigned long long nTempFileBytes;      // 临时文件累计字节
+
+		unsigned long long nWriteBacks;         // Region -> SAT 文本 次数
+	};
+
+	// 故意用函数内 static：AGENTS.md 禁止文件级 static。
+	// CoreLibrary 是静态库且只被 CoreCommand 链接，
+	// 所以这里的实例在 CoreCommand.arx 里是唯一的一份。
+	Stats& GetStats()
+	{
+		static Stats s_stats;
+		if (!s_stats.bInited)
+		{
+			s_stats.bInited = true;
+#if defined(_DEBUG)
+			const char* psz = ::getenv("AEC_PERF_COUNTER");
+			s_stats.bEnabled = (psz != NULL && psz[0] != '\0' && psz[0] != '0');
+#else
+			s_stats.bEnabled = false;
+#endif
+		}
+		return s_stats;
+	}
+
+	long long NowTicks()
+	{
+		LARGE_INTEGER li;
+		::QueryPerformanceCounter(&li);
+		return (long long)li.QuadPart;
+	}
+
+	unsigned long long TicksToUs(long long nTicks)
+	{
+		static long long nFreq = 0;
+		if (nFreq == 0)
+		{
+			LARGE_INTEGER li;
+			if (!::QueryPerformanceFrequency(&li) || li.QuadPart == 0)
+				nFreq = 1;
+			else
+				nFreq = (long long)li.QuadPart;
+		}
+		if (nTicks <= 0)
+			return 0;
+		return (unsigned long long)((nTicks * 1000000LL) / nFreq);
+	}
+
+	// FNV-1a 64
+	unsigned long long Hash64(const char* pszTxt, size_t nLen)
+	{
+		unsigned long long h = 1469598103934665603ULL;
+		for (size_t i = 0; i < nLen; ++i)
+		{
+			h ^= (unsigned char)pszTxt[i];
+			h *= 1099511628211ULL;
+		}
+		return h;
+	}
+
+	Entry& GetEntry(const char* pszTag)
+	{
+		Stats& s = GetStats();
+		std::string key(pszTag ? pszTag : "?");
+		return s.entries[key];
+	}
+
+	std::string TempReportPath()
+	{
+		char szTmp[MAX_PATH + 1];
+		::memset(szTmp, 0, sizeof(szTmp));
+		DWORD n = ::GetTempPathA(MAX_PATH, szTmp);
+		if (n == 0 || n >= MAX_PATH)
+			return std::string("aec_section_perf.txt");
+		std::string s(szTmp);
+		s += "aec_section_perf.txt";
+		return s;
+	}
+}
+
+namespace SectionPerf
+{
+	bool Enabled()
+	{
+		return GetStats().bEnabled;
+	}
+
+	Scope::Scope(const char* pszTag)
+		: m_pszTag(pszTag), m_nStart(0), m_bActive(false)
+	{
+		if (!GetStats().bEnabled)
+			return;
+		m_bActive = true;
+		m_nStart = NowTicks();
+	}
+
+	Scope::~Scope()
+	{
+		if (!m_bActive)
+			return;
+
+		const unsigned long long nUs = TicksToUs(NowTicks() - m_nStart);
+		Entry& e = GetEntry(m_pszTag);
+		++e.nCount;
+		e.nTotalUs += nUs;
+		if (nUs > e.nMaxUs)
+			e.nMaxUs = nUs;
+	}
+
+	void NoteRegionText(const char* pszTxt, size_t nLen)
+	{
+		Stats& s = GetStats();
+		if (!s.bEnabled)
+			return;
+		if (pszTxt == NULL || nLen == 0)
+			return;
+
+		++s.nRegionTexts;
+
+		const unsigned long long h = Hash64(pszTxt, nLen);
+		if (s.hashSeen.find(h) != s.hashSeen.end())
+		{
+			++s.nSimulatedHits;
+			return;
+		}
+		if (s.hashSeen.size() < kMaxUniqueHash)
+		{
+			s.hashSeen.insert(h);
+			++s.nUniqueHashes;
+		}
+		else
+		{
+			s.bHashTableOverflow = true;
+		}
+	}
+
+	void NoteTempFile(size_t nBytes)
+	{
+		Stats& s = GetStats();
+		if (!s.bEnabled)
+			return;
+		++s.nTempFiles;
+		s.nTempFileBytes += (unsigned long long)nBytes;
+	}
+
+	void NoteWriteBack(const char* pszTag)
+	{
+		Stats& s = GetStats();
+		if (!s.bEnabled)
+			return;
+		++s.nWriteBacks;
+		(void)pszTag;
+	}
+
+	void Dump()
+	{
+		Stats& s = GetStats();
+		if (!s.bEnabled)
+		{
+			acutPrintf(_T("\n[SectionPerf] not enabled: set AEC_PERF_COUNTER=1 before starting CAD (Debug build only)."));
+			return;
+		}
+
+		// 报告正文全 ASCII：控制台用 %hs 直出，落文件也直接可读
+		std::string out;
+		char szLine[1024];
+
+		out += "\n================ SectionPerf (Phase 0) ================\n";
+
+		sprintf_s(szLine, sizeof(szLine), "RegionTexts=%llu  UniqueHashes=%llu  SimulatedHits=%llu  HitRate=%.1f%%\n",
+			s.nRegionTexts, (unsigned long long)s.nUniqueHashes, s.nSimulatedHits,
+			s.nRegionTexts ? (100.0 * (double)s.nSimulatedHits / (double)s.nRegionTexts) : 0.0);
+		out += szLine;
+		if (s.bHashTableOverflow)
+			out += "  (hash table capped: UniqueHashes is under-counted, HitRate over-estimated)\n";
+
+		sprintf_s(szLine, sizeof(szLine), "TempFiles=%llu  TempBytes=%llu  WriteBacks=%llu\n",
+			s.nTempFiles, s.nTempFileBytes, s.nWriteBacks);
+		out += szLine;
+
+		out += "---- timing (by tag) ----\n";
+		out += "  count      total_ms    avg_us      max_us   tag\n";
+		for (std::map<std::string, Entry>::const_iterator it = s.entries.begin();
+			it != s.entries.end(); ++it)
+		{
+			const Entry& e = it->second;
+			const double avgUs = e.nCount ? ((double)e.nTotalUs / (double)e.nCount) : 0.0;
+			sprintf_s(szLine, sizeof(szLine), "  %-9llu %10.1f %10.1f %10llu   %s\n",
+				e.nCount, (double)e.nTotalUs / 1000.0, avgUs, e.nMaxUs, it->first.c_str());
+			out += szLine;
+		}
+		out += "=======================================================\n";
+
+		// 逐行输出：%hs 把窄字符串塞进 TCHAR 格式串，不涉及宽字符转换
+		const char* psz = out.c_str();
+		while (*psz != '\0')
+		{
+			const char* pszEnd = strchr(psz, '\n');
+			const size_t nSeg = (pszEnd != NULL) ? (size_t)(pszEnd - psz) : strlen(psz);
+			if (nSeg > 0 && nSeg < sizeof(szLine))
+			{
+				memcpy(szLine, psz, nSeg);
+				szLine[nSeg] = '\0';
+				acutPrintf(_T("\n%hs"), szLine);
+			}
+			if (pszEnd == NULL)
+				break;
+			psz = pszEnd + 1;
+		}
+
+		// 同时落文件，方便事后拿去做分析
+		const std::string sPath = TempReportPath();
+		FILE* fp = NULL;
+		if (fopen_s(&fp, sPath.c_str(), "a") == 0 && fp != NULL)
+		{
+			fprintf(fp, "%s", out.c_str());
+			fclose(fp);
+		}
+	}
+
+	void Reset()
+	{
+		Stats& s = GetStats();
+		s.entries.clear();
+		s.hashSeen.clear();
+		s.nRegionTexts = 0;
+		s.nUniqueHashes = 0;
+		s.nSimulatedHits = 0;
+		s.bHashTableOverflow = false;
+		s.nTempFiles = 0;
+		s.nTempFileBytes = 0;
+		s.nWriteBacks = 0;
+	}
+}
diff --git a/SourceCode/Code2026/CoreLibrary/cmakelists.txt b/SourceCode/Code2026/CoreLibrary/cmakelists.txt
index 341c111..3494639 100644
--- a/SourceCode/Code2026/CoreLibrary/cmakelists.txt
+++ b/SourceCode/Code2026/CoreLibrary/cmakelists.txt
@@ -11,6 +11,7 @@ set(SOURCES
     "AECAngleWatch.cpp"
     "AecComplexCurveDraw.cpp"
     "AecCoverBooleanOper.cpp"
+    "SectionPerfCounter.cpp"
     "AecDb3dRoad.cpp"
     "AecDb3dRoadAxisLine.cpp"
     "AecDb3dRoadFitting.cpp"
diff --git a/SourceCode/Code2026/inc/SectionPerfCounter.h b/SourceCode/Code2026/inc/SectionPerfCounter.h
new file mode 100644
index 0000000..bc0f19f
--- /dev/null
+++ b/SourceCode/Code2026/inc/SectionPerfCounter.h
@@ -0,0 +1,61 @@
+// SectionPerfCounter.h —— Phase 0 计数器：截面（Region）恢复路径的实测探针
+//
+// 目的（见 pipe-section-region-performance-plan.md 的 Phase 0）：
+//   1. 每次截面恢复到底多贵（µs），一次开图总共多少次、多少时间；
+//   2. 同一份 SAT 文本被重复恢复多少次（唯一 hash 数、模拟命中率）——
+//      这个数字直接决定 Phase 1 截面缓存能省多少；
+//   3. 临时文件写入次数与累计字节（杀软扫描影响面）；
+//   4. 放回写（RegionToString / RegionAcisoutDwgOutFields）的次数。
+//
+// 使用方式：
+//   set AEC_PERF_COUNTER=1        必须在启动 CAD 前设好（进程内只读一次）
+//   ENVIPERFDUMP                  在 CAD 命令行打印汇总，同时追加到 %TEMP%\aec_section_perf.txt
+//   ENVIPERFRESET                 清零
+//
+// 只在 _DEBUG 下生效：Release 里 Enabled() 恒为 false，调用点只剩一次 bool 判断。
+// 不改变任何几何逻辑与存盘格式。
+
+#ifndef SECTION_PERF_COUNTER_H
+#define SECTION_PERF_COUNTER_H
+
+#include <stddef.h>
+
+namespace SectionPerf
+{
+	// 环境变量 AEC_PERF_COUNTER 是否开启，且当前是 Debug 构建
+	bool Enabled();
+
+	// 计时作用域：函数入口构造，离开时累加耗时与次数
+	class Scope
+	{
+	public:
+		explicit Scope(const char* pszTag);
+		~Scope();
+
+	private:
+		Scope(const Scope&);
+		Scope& operator=(const Scope&);
+
+		const char* m_pszTag;
+		long long   m_nStart;
+		bool        m_bActive;
+	};
+
+	// 记录一次"待恢复的 SAT 文本"：内部按内容算 64 位 hash，
+	// 统计唯一 hash 数与被重复命中的次数（模拟命中率）
+	void NoteRegionText(const char* pszTxt, size_t nLen);
+
+	// 记录一次临时文件写入
+	void NoteTempFile(size_t nBytes);
+
+	// 记录一次回写（Region -> SAT 文本）
+	void NoteWriteBack(const char* pszTag);
+
+	// 打印 + 写文件
+	void Dump();
+
+	// 清零
+	void Reset();
+}
+
+#endif // SECTION_PERF_COUNTER_H
diff --git a/pipe-section-region-performance-plan.md b/pipe-section-region-performance-plan.md
index f318d6c..7b3754c 100644
--- a/pipe-section-region-performance-plan.md
+++ b/pipe-section-region-performance-plan.md
@@ -88,16 +88,29 @@ pSolidO->booleanOper(kBoolSubtract, pSolidI) // 布尔减
 
 ### Phase 0：先测量（不改行为）
 
-在 `RegionAcisInDwgInFields` 与 `StringToRegion` 两个入口 + 临时文件写/删处加计数，
-`_DEBUG` 编译进、环境变量 `AEC_PERF_COUNTER=1` 开启、命令 `ENVIPERFDUMP` 打印汇总：
+已在 `AecDbEwPipeBase::RegionAcisInDwgInFields` / `RegionAcisoutDwgOutFields` 与
+`CoreTools::StringToRegion`（两个重载）/ `RegionToString` 上接入探针，
+实现见 `inc/SectionPerfCounter.h` + `CoreLibrary/SectionPerfCounter.cpp`。
+
+**用法**（必须是 Debug 构建）：
+
+```bat
+set AEC_PERF_COUNTER=1     :: 必须在启动 CAD 之前设好，进程内只读一次
+:: 打开图纸
+ENVIPERFDUMP               :: 命令行打印汇总，并追加到 %TEMP%\aec_section_perf.txt
+ENVIPERFRESET              :: 清零，方便多次对比
+```
+
+Release 里 `SectionPerf::Enabled()` 恒为 false，调用点只剩一次 bool 判断，无发布风险。
+
+采集项：
 
 | 计数项 | 用途 |
 | --- | --- |
-| 调用次数、单次/累计 µs（QPC 包住整段） | 单次成本（预估 3~15 ms） |
-| 输入文本 hash 的**唯一值数** | 复用率 = 1 − 唯一/总数 → Phase 1 收益上限 |
-| **模拟命中率**（只统计、不改行为） | 同上，更直观 |
-| 临时文件写入次数 + 累计字节 | 杀软影响面 |
-| `RegionToString` / `RegionAcisoutDwgOutFields` 次数 | 查清打开时为何在回写（3.07 %） |
+| `RegionTexts` / `UniqueHashes` / `SimulatedHits` / `HitRate` | 复用率 = 1 − 唯一/总数 → Phase 1 收益上限 |
+| 每个 tag 的 `count` / `total_ms` / `avg_us` / `max_us` | 单次成本，判断值不值得做 |
+| `TempFiles` / `TempBytes` | 杀软扫描影响面 |
+| `WriteBacks` | 打开图纸时为何在回写（3.07 %） |
 
 **决策点 D0**：唯一数是否远小于总次数（例如 30 种 × 1500 次）。
 - 是 → Phase 1 直接做