Freezes

Ok, i bought gmod like a year ago or so. ever since i bought it i have been living with those “Lags” or “Freezes”. Its really annoying. because i play alot of gamemodes.It comes instantly like every minute or so and it freesez for like 2-3 seconds. and that is just so annoying because under those 2-3 seconds u like get stuck and then anyone can kill you and it happends every minute So if any1 knows what is causing those “instantly” freezes pls help me :frowning:

Is this online or singleplayer or both?
How many addons do you have?
How old/what type is your PC?