To tack on some additional info to Mike’s response.
FMRenderer is the process Extensis font managers use to index the glyph comparison data used for the Quickmatch feature. The first time Suitcase builds its database, the FMRenderer process will index every font you have in your library for glyph comparison. It is normal operation for the process to consume as much of the CPU it can to build its rendered data.
Once completed you aren’t likely to see the process run again except incrementally when you add new fonts to your libraries.
Note: The Quickmatch index data is stored with your font vault and will remain there as long as you don’t delete it. If for some reason you do, the FMRenderer process will start all over again.
Hope this helps,
Extensis Font Solutions Team