My short benchmark: current trunk -O3 real 2m16.016s user 1m48.982s sys 0m19.265s trunk + patch -O3: real 2m1.874s user 1m40.467s sys 0m15.127s Will test complete build asap. BTW, Thomas patch improved the situation but the build with trunk is still slower by a few percent that with 4.6.1. Salvatore