Congratulations and a big thanks to everyone involved in improving Rails performance. The 0.13 release is already a lot faster than the 0.12.1 release. Since I like hard facts, I measured 0.13 against 0.12.1 and the current performance branch. configuration 1: r121.06-28 requests=1000, optionsconfiguration 2: r130.07-08 requests=1000, options=-r130 page c1 real c2 real c1 r/s c2 r/s c1/c2 /empty/index 6.99982 6.01380 142.9 166.3 1.16 /welcome/index 7.15241 5.85591 139.8 170.8 1.22 /rezept/index 5.16318 3.78206 193.7 264.4 1.37 /rezept/myknzlpzl 5.16549 3.76001 193.6 266.0 1.37 /rezept/show/713 19.36915 5.83299 51.6 171.4 3.32 /rezept/cat/Hauptspeise 23.04381 8.84068 43.4 113.1 2.61 /rezept/cat/Hauptspeise?page=5 23.42356 8.87389 42.7 112.7 2.64 /rezept/letter/G 21.94957 8.38737 45.6 119.2 2.62 Which shows that a big improvement has already been achieved. But there is still a lot in the pipeline: configuration 1: r130.07-08 requests=1000, options=-r130 configuration 2: perfbranch.07-08 requests=1000, options=-svn page c1 real c2 real c1 r/s c2 r/s c1/c2 /empty/index 6.01380 1.34574 166.3 743.1 4.47 /welcome/index 5.85591 1.51458 170.8 660.2 3.87 /rezept/index 3.78206 1.59911 264.4 625.3 2.37 /rezept/myknzlpzl 3.76001 1.59933 266.0 625.3 2.35 /rezept/show/713 5.83299 4.22347 171.4 236.8 1.38 /rezept/cat/Hauptspeise 8.84068 4.62748 113.1 216.1 1.91 /rezept/cat/Hauptspeise?page=5 8.87389 4.75875 112.7 210.1 1.86 /rezept/letter/G 8.38737 4.78280 119.2 209.1 1.75 So hopefully we can find a way to get the remaining stuff into 1.0 (or 0.14). Cheers, Stefan