Possible online Survival without lags?

Hello,
I want to know, that i can create a online survival game, that wont lagging
I am telling you now how i imaginate my game.

Firstly you should play with max. 4 players in a game.
Every player can choose a character with 5 abilities (principe like League of Legends).
it is a Topdown perspective.
In the game there are zombies ( round 100 Zombies). They are different and some of them have abilities too.
The map does not need the best graphic.
I have allready little lags with 5 zombies and low graphic.
I included abilities, animations and the class instance design.
Would be nice to get informations about how to change the lags

Yes, you can create an online survival game for 4 people, and with good performance to boot. Also, it might be vital for you to distinguish at this point between lag and framerate - as these are 2 completely different things.

Look into the following, it’s reasonably well documented:

thank you for this information