From what I could remember back in like the third public beta or so, they were nice looking, but I had to turn them off due to annoying amounts of lag.
If you do remove them, please keep the code around. They are a nice touch, and once the average graphic capabilities in the customers' PCs go up, you can reintroduce them (with touch ups) in a later major version.
Or maybe a less extreme option would be to have them off by default, even if the program can tell the computer can handle it without extreme amounts of lag, but give the user the option to turn it on, with the warning that it is a very intensive effect. (The current "blacklisting" of the option if the computer is not up to it, unless the user checks that advanced option override, can stay of course)
As others have pointed out, the perspective of it may need a touch up.