AC slow to start blowing real cold air

Chevy S-10 4x4 6cyl '97 w/extended cab.
It used to:
1) Get to a lower temp
2) Cool off the cabin quicker

I don't know much about cars. What I'm trying to find out is, with
compressors, evaporators and condensers, what are the most plausible reasons
for the AC to take much longer than it used to to get to it's coldest
temperature (assuming all other outside variable (outside temp, etc.) are
the same)?

It used to start blowing real cold air within just a couple of minutes -
even on really hot days. Now it seems to take 20 minutes on real hot days.


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I think that the most normal problem is a slight undercharge of refrigerant.
If the charge is not right, then the cooling is slowed. It will probably
never reach
the temperature it should do if properly charged, but often they will
eventually
cool a bit even if low on refrigerant.

There can be other reasons... that is why you trouble shoot, not guess. You
need to have someone put gauges on it, check it out.