When I was making my map, it seems that constant repeating of execution of the "barrier" particle made my game lag. This is the command for it,

/execute @e[type=!Player] ~ ~ ~ /particle barrier ~ ~ ~ 0 0 0 0 1 force

Run the above command in a command block with "Always Active" and "Repeat". And the lesser the amount of barrier particles, the faster my game gets.