I have some serious performance problems in the mentioned versions. 0.9.7 runs perfectly, but in 0.9.8 and 0.9.9 frames per seconds may go down to about 1 every time the "ground" is changed in any way (fire, explosions, ..).

On my main PC (Intel E8200, 2GB, ATI 3870) it runs well also with the new versions, but on my laptop (Intel L2400, 2GB, Intel X3100) the performance is as bad as mentioned before.

But I don't see the point why v0.9.7 runs well an the newer don't because it all looks the same.