I only play FP in desktop mode so I really wouldn't know how much of an impact running 2 screens would be on your GPU. Most cabbers use only a single card for FP and VP so that can't be the issue.
Strange that turning off reflections fixed the blocking issue. Never heard that one before.
Other things that can interfere with FPs performance:
- It does run best on XP, running on Win 7 64bit can have varied results.
- FP is sensitive to background running programes so close everything to free up every last ounce of RAM and CPU power.
For most users, it's trail and error finding the performance sweet spot for FP. We all have different systems and so we all have to adjust our settings accordingly.
FP is not a demanding game to run. It's fairly well optimized to run on most systems and most graphics cards. As long as you have a decent CPU (or 2), a reasonable GPU and plentiful RAM (you can never have enough RAM!) then you should be good to go.
Another consideration are the tables themselves. Each author creates their table in their own way, there is no set guide, so textures will vary in size and compression. This can lead to performance issues but can be fixed by re-sizing the textures yourself....or hoping the original author will create a 'lite' version of the table.