/data merge @e[limit=1,distance=10100] will freeze mobs,drops and lava damage(not tested with other damage) while leaving other game aspects normal(like walking) while /say @e[limit=1,distance=10100] will freeze all aspects of the game.

Upon resuming mobs,they will be accelerated in time(for example,if they're chasing you if you don't go very far they will "teleport" to you)

See attached video.

PS:Video will be avaliable later.