Strange rendering(?) issue

I have an entirely client-sided game(it’s singleplayer) that spawns roblox characters every so often.
The game normally runs smoothly, but every now and then my game get a strange lag spike, and characters that were recently spawned in(just the characters, everything else is fine) don’t render/can’t be seen. Investigating the microprofiler yields thisthis
as the main source of lag.
Anyone know any possible reasons for the characters not rendering and the lag? My issue seems really weird, but I guess God gives his silliest battles to his funniest clowns.