Cache and Map Versions?

Hi All, two questions if I may, separate but sort of linked.

1. On my 4.5Mbps connection I may not always get all the tiles loaded but I'm assuming if a fly a route / area a number of times the cache will slowly build up?

2. Thanks to replies to another post I have only just become aware of the map_version setting in proxyuser.ini. If I am right with my assumption in question 1, then how does that work? Presumably any cached tiles from "old version fights" will be replaced if map_version is updated so there is a trade off, particularly if the cache is relied upon. You can see where this is going!!

Can anyone enlighten me on the above please.

Many thanks.

BF