performance wise how do you rate Keil uvision and Raisonance RIDE
some metrics for evaluation:(additional metrics may be included) -code optimisation -speed -user friendliness -simulation features -support etc..
speed of code generation code optimization efficiency
speed of code generation should not be a concern when working with the limited size you have with a '51. I have nothing where I have noticed the build taking more than 5 seconds (Keil). If you use the IDE I have no idea how long it takes, I use commandline (.bat files).
Erik