Arduino Compiler very slow when running from network drive

Hello. I downloaded and extracted the Arduino IDE version 1.6.5 to a network drive.

I can launch the IDE by running "arduino.exe" from this folder. However, when I compile projects, it takes a very long time, and I can see a huge amount of network activity, even for a very small project. It can take 3-4 minutes to complete.

Compiling the same project from the computer where the files are hosted is extremely fast (on the order of a few seconds).

What is happening? Why does the compiler need to transmit/receive extremely large pieces of data when compiling?

Is there anything I can do to speed this up?

Thanks!