Performance
Performance refers to how long it takes Autodesk Inventor LT to complete an operation on your computer, including loading files.
There are many reasons for performance issues on a CAD system. You can resolve some of them by upgrading to a faster computer or adding more RAM. Keep the CAD system “tuned up” by performing regular maintenance, such as defragmenting the hard drive, also resolves performance issues.
There are options you can configure in Autodesk Inventor LT that strictly go to improving performance. For example, if you open a drawing file with Defer Updates enabled, you increase performance, but you do not change what Autodesk Inventor LT loads into memory.
Capacity
Capacity refers to how much memory is required to do an operation combined with how much memory is being used by your computer at any single moment.
If you routinely work with large data sets or can resolve performance issues by adding more RAM, consider upgrading to a 64-bit computer which can access terabytes of RAM.