Bukkit

Version 1.4:

• Add 'tileupdatedelay' setting (global, per world, or per map) - limits how often tiles that are repeatedly modified will be rendered (reduce load due to automation such as quarries, machines)
  
• Added TerraFirmaCraft block rendering support
  
• Add XyCraft block rendering support
  
• Major updates to Forestry and Red Power 2 block rendering support
  
• Improved rendering accuracy on fences and walls
  
• Added support for Greg's Lighting, MystCraft, ExtraBees and additional Thermal Expansion support - Thanks to HanFox and dannybear!
  
• [Bukkit] Fix API use issue that broke v1.2.5 support
  
• [Forge] Fix error with throttling of chunk loading which often causes the chunks-per-tick limit to be far exceeded (causing lag)
  
• Improve debug information during calls to server thread (chunk loading, etc)
  
• Improve parsing of Forge configuration files
  
• Support for IC2 Advanced Power Management (thanks to dannybear!)
  
• Support for IC2 Advanced Solar Panels (thanks to dannybear!)
  
• Support for Thermal Expansion (thanks to HanFox!)
  
• [Forge] Improve default world names (such as 'world/Twilight Forest')
  
• Add support for hiding players that have active invisibility potions (controlled by hide-if-invisiblity-potion setting)
  
• [Forge] Add controllable render-triggers: blockupdate, lightingupdate, chunkgenerate, chunkpopulate(v1.4.6+). Also, blockupdate-with-id triggr (blockupdate with extra logging data to track which block IDs are source of updates).
  Also, performance debug trigger 'blockupdate-with-id'- same as blockupdate trigger, but shows counts by block ID and data value to determine which block types are driving changes (via /dynmap triggerstats command)
  
• Tune performance of chunk fetching on server thread - reduce lag
  
• Add support for Fancy Fences wall rendering
  
• Add workaround for IE10 zoom issue (force IE9 compatibility)
  
• Add support for reporting available dynmap version updates