Nios-I speed in QuartusII 5.0

I could have sworn I saw this posted somewhere else.

Check your Quartus project settings to make sure nothing was modified in the upgrade (a lot has changed since 4.0). I have noticed "Auto Fit" being turned on sometimes after the upgrade and you want that to be set to "Standard" in most cases.

Here's a set I find useful for big designs like the standard and full-featured reference designs:

Multiplexer restructuring --> off

State machine encoding --> one hot (make sure you don't have any large statemachines in your design since they will become very big)

Standard fitter effort

Combinational physical synthesis

Normal physcial synthesis effort

Hope that helps