You can select the maximum memory that Wordfast Pro 3 will use to ensure you can open and work with large files with ease.
To select memory preferences:
Open Wordfast Pro 3 and click
Edit > Preferences > General
> Memory Preferences.
The Memory Preferences dialog box appears.
Select the amount of memory
Wordfast Pro 3 will use on your machine and click OK.
Note: Maximum memory is the Java heap size. If the memory size
selected here is more than the available memory, you may get a Java
heap size error.