How to make IntelliJ run reasonably well on USB?

I've got IntelliJ working from a USB on a work computer that I'm trying to leave minimal traces on, but it's not working well. I've got the config, system, plugins, and logs pathed to the USB from idea.properties and I've changed JAVA_HOME and IDEA_JDK_64 (or whatever it's called) environment variables to the appropriate path on my USB. But it's running so slow that it's borderline unusable.

Aside from pulling the entire IntelliJ folder onto the PC and deleting it everyday, are there any smaller tweaks I can make to get it to run at a reasonable speed?