donsprintr: I've been using pepperflash nearly trouble free for over a year.
Then you're one of the lucky ones that can get away with it. I can vouch for what it does to the game because I've been setting up a backup laptop (exact match) and of course, the first thing that gets made right for me is WGT.
Having to DL a decent browser, I get stuck with the current version of Flash which, with Chrome, has that pepperflash nonsense included, not to mention version 16 point something of Flash. Invariably, I get that really strange click and miss where I know I nail the swing and it stops late.
Disabling that pepper version always fixes the issue. I had to uninstall and reinstall Flash because of user error and this is how I am certain pepperflash causes issues-I found my error when I played and still got that mysterious lag. Apparently I did something wrong and the 2 versions of Flash were still enabled causing the lag. Kill the PF and all is good. :-)
p.s., This was all only because of me setting up a new computer. I use ComodoDragon with Flash version 11.something for the game and it plays flawlessly. No exaggeration. Getting there is where I verified the pepperflash crap.
p.p.s, How do you know your occasional late hit isn't a result of that and not you just missing? ;-)