Intrinsic slew rate of an OpAmp is governed by internal compensation C and
the current source biasing the stage. Actual response of course large Cload
will limit rate of change of output due to driver stage available current limita-
tions. Usually the limit is output stage current limiter in limit. Which is dominant
obviously based on Cload value.
Slew Rate is a large signal response issue, application notes discuss this.
Adding Cload generally not desired, decreases phase margin (stability) due to
OpAmp output Z causing phase lag with Cload, affecting feedback.
Understanding Slew Rate in Op-Amp and How to Measure and Calculate it for your Designs
Your diode question, one could imagine in one direction it decoupling the
OpAmp from the Cload, like as in rectifier, so OpAmps output would slew
at its intrinsic rate in one direction, not the other. Cload when its decoupled, its
change dependent on load discharge path. Also depends on is diode in feedback
path or just a series connection from OpAmp output to Cload.
Regards, Dana.