In my experience 5.10 isn't that much faster than 5.8, the improvement was mainly in stability and reduced number of bugs. 5.8 ran somewhat poorly on my system with crashes fairly frequently and lost some files as well during save. So far 5.10 hasn't done either of those yet. The unstable release of 5.110 is out just now in the past week or so but it's just that unstable. I've installed it now and have run through several character gens to check it out. So far seems decent but a little witchy here and there, enough that I'd stay with 5.10 for campaign use until they put the stable version out.