Add file cache and timer fix to release notes and DLL_README

DLL_README.md

@@ -188,6 +188,32 @@ Lua API for addon developers:
 
 ---
 
+### MPQ File Cache
+
+Caches the results of MPQ archive file lookups so repeat file opens skip the expensive archive chain walk and hash table probe. The game re-opens the same model and texture files hundreds of times per second during gameplay -- each lookup normally searches through every loaded MPQ archive. The cache remembers which archive contains each file and returns the answer directly.
+
+Cache hits cost roughly 1/30th of a full search. During heavy gameplay (cities, raids, zone transitions), this saves 50-160ms every 15 seconds. In quiet scenes with few new models loading, there is little to save because the game does fewer lookups.
+
+The cache validates that archives are still alive before returning cached results, so if the game closes or reloads an archive, the cache falls through to the original search.
+
+No configuration needed. Enabled by default when using `weirdutils.dll`.
+
+**DLL:** `filecache.dll`
+
+---
+
+### Timer Calibration
+
+Improves the game's internal timer precision by recalibrating the TSC (Time Stamp Counter) frequency using the OS performance counter as a reference. The vanilla client's built-in calibration is inaccurate, which can cause animation stutter and timing jitter on some systems.
+
+Also requests higher OS timer resolution (0.5ms instead of the default 15.6ms) and disables Windows 11 power throttling for the game process.
+
+Ported from [VanillaFixes](https://github.com/hannesmann/vanillafixes). Primarily benefits native Windows. On Wine/Linux the game typically uses GetTickCount instead of TSC, so this module enables TSC mode with a proper calibration.
+
+No configuration needed. Included in `weirdutils.dll`.
+
+---
+
 ## Why No Source Code?
 
 This project is distributed as pre-built DLLs only. The source code is not and will not be made publicly available.

RELEASE_NOTES.md

@@ -58,9 +58,26 @@ Track notable changes here between releases. Clear this file when cutting a new
   for ClipPolygonToSinglePlane (4x), BuildTrianglePlanes (10x), rotateMatrixByAxisAngle
   (4.3x), RayTriangleIntersection (1.3x), multiplyMatrix4x4 (4.3x).
 
+- **VanillaFixes Math Polyfill** (WIP) - incorporating x87 FPU replacements from UnitXP
+  and libSiliconPatch into our SSE pipeline. Replaces ~20 game math functions (matrix
+  multiply, vector ops, collision geometry, animation interpolation) with SSE or modern
+  scalar equivalents. Compiled ReleaseFast as a separate compilation unit (math_sse.zig).
+  Not yet wired into hooks -- will be its own module with independent mutex.
+
 - **Glyph Shadow Cache** - direct-mapped O(1) bypass for the game's 4-bucket hash table
   in GetOrCreateCharacterGlyph. Reduces glyph lookup from ~3.65% frame time.
 
+- **MPQ File Cache (filecache)** - 2-way set-associative cache for File_FindInArchive
+  (0x6549a0). Skips the MPQ chain walk and per-archive hash table probe on repeat file
+  opens. Cache hits cost ~1000 cycles vs ~30000 cycles for full search. 60-90% hit rate
+  during gameplay, saving 6-160ms per 15s reporting period depending on scene load.
+  Validated via game's own FindAndIncrementResourceReference to handle archive lifecycle.
+
+- **Timer Fix (VanillaFixes port)** - TSC calibration, OS timer resolution (0.5ms via
+  NtSetTimerResolution), and Windows 11 power throttling disable. Ported from
+  hannesmann/vanillafixes. Primarily benefits native Windows; no measurable impact on
+  Wine/Linux but applied unconditionally.
+
 - **MPQ File Cache** - hooks File_FindInArchive (0x6549a0) to cache archive lookup
   results. First open does full MPQ chain walk (~60K cycles), subsequent opens hit
   direct-mapped cache with filename verification (~300 cycles). 80% hit rate in testing.