becasue the walk speed comparrison of cav to infantry is not very realistic   But then again how run is used in game is not exactly realistic either, but that is where cav have a much better advantage over infantry.

Why nerf the speed of cavs? The whole point of cavs is being fast. If cavs are slow then just use infantry instead. We do need strong units but at reasonable quuantities. 

Currently, the RangeOverlayManager is serialized, so a difference will create OOS. Take a look yourself at the difference between the two oos_dump.txt files.

too bad ur afraid to explore historical, they have slight speed nerf there

Maybe an unpopular opinion, but I think all cavalry should get a slight speed nerf — or alternatively, pikes and spearmen should move a bit faster — so that cavalry players can't always choose when and where to engage. Additionally, the damage multiplier of spears and pikes against cavalry should be increased to make them more effective counters. I think cavalry should be a more tactical or support role unit, rather than being the main army core — unless a specific civilization or historical context justifies otherwise.

When I was originally advocating to implement unit acceleration I was suggesting it only for cav. It seems people wanted it for infantry as well so here we are. @Seleucids of course any nerf to cav speed would need to be proportional and take the full gameplay result into consideration, so forgetting to update archer and firecav move speed would be an obvious mistake rather than something inevitable.

Don't you worry, there is so much lag in networked games (especially more than 2 players) that dancing is non-existent.    Sadly they do need this speed to counter fire cav and archer.    All in all, I think champions occupying 3 population each is probably agreeable. If you want to make 30 champion cavs then you bascially have no pop space for anything else.  If there is objection to moving them to fort, maybe we can consider other special buildings.  I picked fort because that was the champion building in the past and was expensive enough to counter rich players spamming it.