Currently 0 A.D. performance is lower than that of similar RTS games, especially when playing with many units on a map. This page collects some tasks and suggestions to improve performance of pyrogenesis, the engine used by 0 A.D.. To discuss other performance related ideas you can use the [http://www.wildfiregames.com/forum/index.php?showtopic=16991 Performance Optimizations forum thread].

== Ongoing improvements ==
{{{#!table style="background: LightGoldenrodYellow"

||= Feature =||= Relevant link(s) =||= Performance impact =||= Status =||
|| Support OpenGL 4 || #3054 [http://www.wildfiregames.com/forum/index.php?showtopic=16734 forum thread] || Big || Work in progress ||
|| Threading to use more than one CPU core || #5874 || Big || Work in progess ||
|| !Short/Vertex Pathfinder Rewrite || #1942 || Big || Not started ||
|| Improvement/replacement for AI entitycollections || #2370 || Big || Stalled ||
|| Assorted "megapatch" patches || [http://git.wildfiregames.com/gitweb/?p=0ad.git;a=shortlog;h=refs/heads/projects/philip/megapatch-split git branch] || Medium || Stalled ||
|| GUI code improvement || #885 || Medium || Stalled ||
|| !ComponentManager optimization || #1860 || Medium || Stalled ||
|| General pathfinder optimizations || #3588 || Medium || Work in progess ||
|| Implement caching of terrain normals || #2039 || Medium || Stalled ||
|| Calculate visible patches only when frustum changes || #2431 || Medium || Stalled ||
|| UnitAI/UnitMotion repathing improvement || #1200 || Medium || Not started ||
|| Enable the JPS cache || #3290 || Small || Stalled ||
|| Disable off-screen animation || [http://trac.wildfiregames.com/browser/ps/trunk/source/simulation2/components/CCmpUnitRenderer.cpp#L293 TODO in CCmpUnitRenderer.cpp] || Small || Not started ||
|| Skinning optimisations || #2026 || Small || Stalled ||
|| More optimization with many selected units || #2179 || Small || Work in progress ||
|| Optimisation of Fixed Point Trigonometic Approximations || #2109 || Small || Work in progress ||
|| Implement a !Quadtree/Octree || [http://www.wildfiregames.com/forum/index.php?showtopic=17384 forum thread 1] [http://www.wildfiregames.com/forum/index.php?showtopic=16991 forum thread 2] || ? || Stalled ||
|| Rewrite the AI base system in C++ || [http://www.wildfiregames.com/forum/index.php?showtopic=16991 forum thread] || ? || Not started ||
|| Benchmark mode || #837 || n/a || Not started ||
|| Implement profiling for any thread || #807 || n/a || Not started ||

}}}

== Completed improvements ==
{{{#!table style="background: LightGreen"

||= Feature =||= Relevant link(s) =||= Performance impact =||= Appeared in =||
|| Pathfinder optimizations || r17310 r17350 r17413 r17500 r17866 || Big || alpha20 ||
|| Optimize range queries || #3717 || Medium || alpha20 ||
|| Optimization of isBoxVisible || #3712 || Small || alpha20 ||
|| Reduce calls to !CalculateTerritories || r17560 || Small || alpha20 ||
|| !Long/Tile Pathfinder Rewrite || #1756 r16751 || Big || alpha19 ||
|| Other Pathfinder optimizations || r17251 r17284 || Medium || alpha19 ||
|| !RangeManager improvement || #2430 || Medium || alpha19 ||
|| UnitAI improvements || r17264 || Medium || alpha19 ||
|| Several AI optimizations || r16008 r16027 r16028 r16030 r16035 r16042 r16073 || Medium || alpha18 ||
|| Upgrade [https://developer.mozilla.org/en-US/docs/SpiderMonkey SpiderMonkey] to [https://developer.mozilla.org/en-US/docs/Mozilla/Projects/SpiderMonkey/31 v31] || #2462 || Medium || alpha18 ||
|| Reduce lag when selecting units || r16068 || Medium || alpha18 ||
|| Unnecessary global message subscription || r16055 || Medium || alpha18 ||
|| Add type specific method to cmpResourceGatherer || r16036 || Medium || alpha18 ||
|| Visibility performance improvement || r16166 r16248 r16281 r16328 r16337 || Medium || alpha18 ||
|| Improve performance of unitAI looking for new targets || r16057 || Small || alpha18 ||
|| Improve fogging performance || r15956 || Small || alpha18 ||
|| Replace CParser || #2589 || Small || alpha18 ||
|| Dynamic message subscriptions || r15400 || Medium || alpha17 ||
|| New unit renderer || r15265 r15266 || Medium || alpha17 ||
|| Increase performance of random map generation || r15621 || Medium || alpha17 ||
|| Use new ES6 keyed collections (e.g. Map, Set) || #2475 || Small || alpha17 ||
|| Optimise silhouette rendering || r15483 || Small || alpha17 ||
|| Improve GCC build flags on x86 || #2329 || Small || alpha17 ||
|| Build fcollada with -O2 || r15675 || Small || alpha17 ||
|| Improve UnitAI range query performance || #2156 || Medium || alpha16 ||
|| Save GUI Sprites and Images in vectors / maps as pointers || #1984 || Small || alpha16 ||
|| Improve speed of territory computation || r14530 r14531 || Small || alpha16 ||
|| Speed-up of the foam generation code || r14514 || Small || alpha16 ||
|| Make entity selection faster || #2358 || Small || alpha16 ||
|| Minor LOS optimization || r14463 || Small || alpha16 ||
|| Graphic settings system || #475 || n/a || alpha16 ||
|| Renderer optimizations || r13902 r13903 r13904 r13906 r13911 || Medium || alpha15 ||
|| Optimize fixed multiplies on Windows || r13873 || Medium || alpha15 ||
|| CCmpRangeManager optimization || #1707 || Medium || alpha15 ||
|| Optimization with many selected units || r14296 r14306 || Small || alpha15 ||
|| Optimize Move() in !CCmpUnitMotion || #2094 || Small || alpha15 ||
|| Text rendering optimizations || r14017 r14018 r14019 r14020 || Small || alpha15 ||
|| Avoid slightly-expensive !QueryInterface?() calls || r13825 || Small || alpha15 ||
|| Improve game setup GUI performance || r13828 || Small || alpha15 ||
|| !GetPercentMapExplored optimization || #2012 || Medium || alpha14 ||
|| Disable distance-sorting for most transparent objects || r13753 || Medium || alpha14 ||
|| VBO support for minimap entity rendering || r13454 || Small || alpha14 ||
|| Water improvements || r13374 r13555 r13720 || Small || alpha14 ||
|| JS GUI code optimization || #1878 || Small || alpha14 ||
|| AI API v3 and Aegis AI || [http://www.wildfiregames.com/forum/index.php?showtopic=17144 forum thread] || Medium || alpha13 ||
|| !GetInterpolatedTransform math optimization || #1854 || Small || alpha13 ||

}}}

== Other related resources ==
 * [http://www.wildfiregames.com/forum/index.php?showtopic=17274 Forum thread: (DISCUSS) Performance Improvements]
 * [[CodeAndMemoryPerformance]]
 * [[CodeQuality]]
 * [[Coding_Conventions]]
 * [[EngineProfiling]]