Grid seems ok to me lately...compared to last year for sure things are a lot more reliable, so at least on the Rezzable sims things are ok. The switch to H4 could have been a lot worse--nothwithstanding the impact on pre-H4 scripts. But seems like sim work better, faster. Big opportunities now with higher sim altitudes. I still think people sharing parcels have a lot of neighbor issues that impact SL performance perception. People also overload their areas and avatars wear a lot of silly attachements that crash the sims. For me, grid is pretty amazing in current state, so definately don't see stability as biggest problem.