I have this problem of the slow editor reponse, too and would REALLY LOVE to
have it fixed in one of the next resharper builds.

My machine specs:
CPU: Intel P4 2,66GHz (no hyperthreading)
HDD: 120 GB Seagate ST3120023A
1 GB Ram
Nvidia GeForce4 - 8x Ti 4200 ; 128 Mb Memory

I did the following to find circumstances which affect this performance
bottleneck (without success)

• deleted every _Resharper directory I could find
• cleared the Resharper cache from the options dialog.
• deleted *.suo, *.user
  I didn't try to uninstall Resharper and VS 2003 (I was afraid of loosing all
  my settings)

Then I found all the pdbs and debug info in the released assemblies and
thought "why not give dotTrace a try".
What I did was to fire up my VS 2003 placed the cursor after the open
bracket of a command call (5 parameters).
Then I started the profiler, switched back to VD 2003, pressed CTRL+P and
typed one character ('a'). It took 2 secs until I saw that character - this
was not the slowest one.
The snapshot I took afterwards is attached to this post (Unfortunately I had
to split it into two. the second one comes in a separate post).

Hope that helps. Please try to fix this asap because I can't live without
Resharper.