Player spawn lag

I run a 12 slot (rented from a company), and I hardly ever get lag and it runs great. With the exception whenever a new player spawns for the first time everything lags for about 1 seconds or so. It is rather annoying and thought about adding 8 more slots, but not with this. Any ideas?

Addon list-

adv dupe
anti-noclip
assmod
breakable props tool
buoyance tool
connas tools
drugzmod
exit point
fin2
infotool
jumppad
mobile spawn v2
multiweld
no collide world
no collide multi
measuring stick
pewpew
phx3
sbep(edited to only parts assembler tool and models/materials/sounds, no ents)
simple prop protection
smart constraint
smartsnap
stacker
sui scoreboard
super parent
releporter
adv stacker waterizer
weightstool
wire
wire modelpack 1
wire extras

A lot of these have been modified like sbep to reduce lag… just have player spawn lag.

Nothing?

And… nothing?