(Mainly) I'm worried about poor performance.
When i think in my old projects in vb6.0, vs2003 is too slow, vs2005 will be more slow or really will have better performance
My developer machine is P4, 3.2Ghz, w/2Gb Ram, and run well. (not amazing, but well) but when i need talk about final version i found in many cases, machines with Pentium III or Celeron around 1Ghz, and 256 in Ram, so .Netframwork 1.1 really is too slow.
What could be good decision for gain performance with my clients, without require upgrate all PCs to run lightly better. (Old times, vs2003 or vs2005 ).

to change or not to change (net1.1-2.0)
Daniel Chu
>> What could be good decision for gain performance with my clients,
Optimise your code :-)
There is no reason in the world for .NET to be regarded as slow. I remember the first C# code I wrote was much slower than C++. The code I write now, is not. It's a question of knowing how to best use the framework.