New Remote connection needed ??

Every now and then when using "screen sharing' and to remote in to my Mac mini everything is ok till I switch desktops (multiple desktops).

'Active' transfers don't pause imminently, but wait a bit, then they do.

If on the same desktop, then all is ok, even if windows are in front.

If this the best way to share/transfer files remotely ? or is there a better way..?

Also, no matter what resolution I set when connected up physically, it is never full screen remote on my MBP. When I take it Full screen, i see black bars either side. Trying to adjust this remotely, under display,doesn't do anything.

So, either use screen sharing or something else that can handle full screen.