Thanks for your fast response.
Are you sure, that resetting to factory defaults will solve that problem? The eclipse is always fast, when i turn it on. It's getting slower durig a period of appr. 3 hours. Then I switch it off and on again – and, voilá – it's as fast as before.
Is there a known bug in one of the presets simulating ModFactor and TimeFactor? It occurs to me, that the problem is coming up, when I use large presets.