Well - let's see.
"My forces are on a defend mission" - so the AI will be getting about 3 times your points.
The enemy is
green so:
It has masses of junk,
not "expensive industrialised armies", the best being a few Leo-1. Everythying else is EE-9 scout cars, T-54, and M3 halftracks, since green is used for the unnamed central American armies (Red being used for the unnamed bits of the former USSR).
Greens experience at this date seems to be the mid to high 60's - so it'll get about a 10% hike in numbers since units will be cheaper.
Loading the save game as a scenario we see:
green has 492 elements
Green has 144 formations
The artillery pages extend to 3.5
There are about 2, maybe 3, entire battalions of tanks, same of mech inf in tin can halftracks or cheap wheeled things, and of course the same or greater amount of leg infantry and engineers. The top right of the map is absolutely stuffed with junk. You can only see a few forbearers of the horde at the moment, which is what your Hinds are plinking.
There are absolutely no "high ticket" elements to soak up points (such as modern fighters, or ADA, or any truly expensive arty - plenty of 210 point 155mm M114 platoons though). Its air strikes are a few dragonflies, and its ADA a few Igla MANPADS and som AAMG tracks.
It's a "North Korean horde" -
no wonder it will take 5-10 minutes to play it's turn (is the AI complaining when
you take a half an hour to do your bit?)...
The map does not help matters, being a crowded "Balkans" type set up of heavily wooded hills, with spots of rough and rough slope to navigate through.
It's not the points value that makes for a long time,
it is the sheer number of AI elements. The AI spent about 2 minutes taking low-value main gun potshots at those 2 stationary hovering Hinds. The rest of the time is spent in moving the horde forwards, plotting its artillery etc. All that took about 5 or 6 minutes on my 6 year old 3Ghz P4 single processor Dell with 2MB RAM.
If you want the enemy to have a low unit count - then use a technically advanced (NATO, WARPACT, Israeli etc) one, not one that generates an "Orc Horde".
Cheers
Andy