This will allow forms to load faster, but will affect your system memory, so use this sparingly, mainly on the top 3-4 forms you use all of the time.

1. Open the particular screen you wish to Memory Cache.
2. From the screen menu, select Tools -> Options.  This will clear your current screen, so be sure to have already saved your data.
3. From the first screen that opens, select the checkbox for Memory Cache, and check it.
4. Click the OK button.