Thanks everyone for all the suggestions.
I checked the brushes (was easier than I feared). But there was still nearly an inch on both, so I doubt it is brushes.
I also didn't think bushings because the blade spins freely (I should have mentioned that in the OP).
I also didn't mention that the saw is on its own 29A/12GA circuit with a very short run.
For TomCT2: the point of the OP was the saw is bogging down, yes under load... I only mentions the slow start because it might be related, but I wouldn't give a damn about slow start if it didn't also big down.
So maybe the bottom line is it's just time to upgrade as DrRobert suggested. Heck I've had a lot of good years out of that saw and it was never a great saw to start with (small table, difficult to adjust, low quality fence, ...)