First off, while playing the game (started either through playtest or directly through
executable) try pressing F1 (if you're in a laptop you might need to hold the Fn key
as well). This will bring up the game properties where you'll immediately see
the smooth mode and reduce flickering options. You might wish to toy with those
two settings and see what the outcome is. I tested personally and whereas the smooth
mode ought be mandatory the flickering doesn't offer any
visible changes.
If you're on a Windows system, you could also open the task manager (ctrl+alt+delete),
click on details, right-click Game.exe, go to set priority and change said priority.
On my laptop I tried all of these and the game does, seem more fluent, even on
the power conservation mode.
With that out of the way, an other thing you might wish to do if you're trying to increase
the game's standard frame rate is, as an other user already suggested, pressing the
script editor button within R.M.X.P., clicking onto the RGSS2Compatibility section, then
pressing ctrl+F and searching for "Graphics.frame_rate=" (without the quote marks).
The previous user claimed it was on the 72nd line, however I found it on the 67th,
this probably due to the recent updates. Now you oughta be reading
"Graphics.frame_rate=40".
As you may already have assumed, you can change that number to something else.
I tried going for a 60 framerate, however I personally find it too fast and would
suggest rates between 41 and 50... if it wasn't for the fact I get black-screened each
time I trigger a wild encounter at those rates...
Other methods to increase the F.P.S., albeit externally, would be an application called
Cheat Engine or the
RM FPS Control.
I tested RM FPS Control as well, and sadly the same black screen issue perpetuates if
when a wild encounter is triggered the framerate is set between 41 and 59.