I suggest trying a program such as nullparticles and what-not there are some decent ones out there somewhere that can limit what the client can do even beyond the ini config edits.
Also something like this for your shortcuts target line: "C:\Program Files (x86)\Grinding Gear Games\Path of Exile\PathOfExile.exe" -gc 2 -ns -swa --noasync
(This is a standalone client directory path, specifically pay attention to the -gc 2 -ns -swa --noasync
Including a space between " and -)
This should boost your fps significantly, additionally there are data charts online somewhere to specify what individual components work best with 32 bit clients.
Good luck!