That's not a good frame rate. My computer has this situation:

( ls /Applications/.app 2>/dev/null ls /System/Applications/.app 2>/dev/null ls ~/Applications/*.app 2>/dev/null ) | wc -l 730

For me, it was really slow at the beginning, but it got much better after that. I'm not sure why, but this at least shows that there are still big problems with the current performance...