Welcome to Subsim.
First, whats your system specs? CPU, RAM & GFX Card.
We might be able to tweak the AA & AF settings to improve performance.
Also, are you just playing Stock SH3 1.4b or are you using any mods?
There are a few settings available for Stock SH3 that might help. Enabling Low Textures & Reducing the Particles Settings.
Let's start with your System Specs first.
