Time to write something trivial again. Lets see...
Pvp time efficiency most efficient fast clear is currently surviving 2 attack rounds without skills with dd and short all wild next chain but since not everyone can have 4,5k defense attack team lets focus to pvp gods.
Leader pvp god boosts team performance ridiculously but its very likely heal part is actually overkill for already decent teams and therefore animation wastes time.
Finisher duo mgx/ its dm counterparts + dd mon prefetably wvsm is really realiable fast finisher with other dual mons making enemies less likely to survive thanks to resistances.
When discarding cards and before activating all wild next its prefetable to have at least 3 colours with un even amount of cards to leave chain as short as needed and still with dd skill active damage should be +4k~ being more than enough. When unlucky damage order happens leaving 1 enemy standing, mon such as a&d vamp damage is fast enough executioner.
Outside of batles loadings are annoying and can be done nothing but for rewards it might be slightly faster to have inventory full and to get hd offer (just be catefull enough to not accidentally buy from it).