3K = 3,ooo feet on an altimeter in AH. Even if it were 3K meters/yards that is still slow for anything but a heavily laden bomber, a C47 or a P-47.. ...
"In WW2OL it took me a good 10 mins to climb up to 3k"
Try inverted next time it should only take about 30 seconds at most!

But 10 minutes to 3K in WWIIO? That's a joke right? Was your gear still down? Did you have your throttle moved forward at all? Did you mean 30K and not 3K?

Spare yourself some frustration and simply don't use WWIIO as your measurement stick for reality. Just as AH is not the place to look for serious ground warfare. Enjoy WWIIO for it's "flavour" and immersion - if you're able to ignore some really stupendous "issues" such as bombs "timing out" if dropped from higher than 3K and no stress model so heavilly laden bombers do the loopety-loop over AB's performing spectacular stunts of pure airquake. I'm sure the fan bois will link this topic over there and they'll spew about it and doctor "developer" and the hatchet man will scoff and maintain that WWIIO's FM is the still the mostest and bestest (well, after they fixed the HELO-110, removed the THIRD wing from the 109, performed uncountable audits on the aircraft FM's because of obvious problems, etc etc)
From takeoff to 3K would take most WWIIO fighters about 3 minutes tops. And at 3K feet you're still pretty darn close to the ground so things should look large still. Grown trees in RL are about 75-200 ft tall. Unless you're used to looking at relatively young growth in a 20,30 or 50 year old subdivision.
Where I'm from if it's under 100 ft tall it's still a sappling and never had the chance for Daniel Boon to carve his name on it it .
