Add perf and thread-labelling features to readme.

Change perf numbers from relative reductions to speed improvements,
for clarity.

README.md

@@ -143,6 +143,10 @@ See [jgrpp-changelog.md](jgrpp-changelog.md) for changelog.
 * Show a company-coloured mark next to vehicles in vehicle list windows, if their owner does not match list owner (imported: by McZapkie) (added in v0.8.0)  
   This has been  modified to change the mark and be controlled by a setting (on by default).
 
+* Performance improvements  
+  * Improve dedicated server performance. Up to approximately 2.5x faster. (added in v0.8.1)  
+  * Improve cargodest link graph calculation performance. Up to approximately 33% faster. (added in v0.8.1)
+
 * Save/load and savegame format changes  
   * Various changes to improve handling of savegames which use features not in trunk.  
   * Savegames from this patchpack are not loadable in trunk.  
@@ -158,6 +162,9 @@ See [jgrpp-changelog.md](jgrpp-changelog.md) for changelog.
   * Fix YAPF pathfinder desync issue involving rail track type changes which where only passable by a subset of vehicles (trunk bug). (added in v0.6.0, fixed in trunk as of v0.7.1)  
   * Logging: Various changes and improvements to desync-related logging and debugging, see changelog for details.
 
+* Miscellaneous  
+  * Label threads with a descriptive name on supported Unixy platforms. (added in v0.8.1)
+
 * Translations  
   * German (by Auge): including vehicle group info, vehicle details window, the zoning toolbar, and settings for improved breakdowns and adjacent level crossings.
 

jgrpp-changelog.md

@@ -8,8 +8,8 @@
 * Fix version detection of when git support is missing.
 * Label threads with a descriptive name on supported Unixy platforms.
 * Performance improvements:
-  * Improve dedicated server performance by between 0% and approximately 60%.
-  * Improve cargodest link graph calculation performance by between 0% and approximately 25%.
+  * Improve dedicated server performance. Up to approximately 2.5x faster.
+  * Improve cargodest link graph calculation performance. Up to approximately 33% faster.
 * Add German translations by Auge, for the improved breakdowns patch.
 * Desync debugging: Changes to debug random logging.
 * Bump trunk base from r27455 to r27466