Some have indeed reported that, I personally haven't noticed any difference, my game has always run relatively well. Of course there are those that are complaining the lag is worse. Hard to know who's in the majority here without some reliable statistics.
I've noticed the textures load in quicker now, my game always used to crawl to a halt and all the textures would go low res, haven't had a single issue since the update. Might just be me but i think the game looks a lot sharper on the PS3 since the update.
If I keep my game running for a long time it'll start to lag big time. .
Yes, that happens to me. If I've left the game on a long time it jerks very badly with frames often updating only about 1 a second. But that is better than freezing altogether. After 1.9 that the game sometimes seems like it has frozen, only to continue fine after about 3 seconds. It seems to me that these might be instances where before the game would have totally frozen but 1.9 manages to get past the freeze point.