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I'm not quite sure this is the proper place to post this, so sorry if it's not.
I'm a new player and as such need a lot of practice but it seems custom games are a on a far lower priority server side.
When I got to the point I couldn't play any custom games because of lag, I got to thinking that custom games with only bots/one person might be hosted locally to allow practice (maybe even when the server is down?).
I'm not sure if this is a viable option, but I thought I'd just throw in my 2 cents.
EDIT: Hm.. nvm.. I should've posted this on EU forum, didn't notice, sorry for the inconvenience.