The putting meter seems to be affected more in general because of motion on the playing screen during a putt. Things like the putting grid and the flag animation are usually only factors in shots on and around the green. I've notice that these two elements cause a lot of lag during putting. The flag you can do nothing about, but if you turn off the putting grid it will disappear when you got to stroke your putt.
@WGT... please tame the flag animations or give us a similar option as the putting grid! It's nice for the ambiance of the game, until it affects performance!
Lee