I gave up early on expecting speed on decent mods

slicing > farming
I only farm when i run out of mods that are worth slicing. Grey mods are underrated imo. Grey mods with a speed secondary (lvl them to 12) aren't that hard to find and can potentially become amazing. If you farm -> lvl -> slice enough of them you'll eventually end up with solid mods.
Between the mod store, decent mods from farming right of the bat and farmed mods you need to slice first, it's a whole lot easier to get great mods than it used to be imo.