You’re likely using Factions version of LVC what I call v2 (what LVC V3 is based on), one of the most widely used scripts in FiveM. That consumes about 5-10ms client side. Its network calls are managed quite well with Lt. Caines logic.
The additional features added to LVC bring the client-side 10-15ms. Approximately 5ms average higher. You may have noticed LVC uses Plugins to expand its functionality (Traffic Advisor, Extra Toggling, etc.) this adds more overhead approximately 10ms however these plugins are still on their first release and can be optimized AND are optional developers can pick and choose what features are right for them.
RageUI the menu adds a larger overhead (~45ms total) when open but, that is something not often used day-to-day.
I have tried my hardest to use programming best practices and thread best practices outlined here: [Best practice] Improve your resource performance
THIS IS NOT ELS though which has a very very very high overhead and is what most people complain about when it comes to siren controllers.
TLDR:
LVC V2 (Faction/LtCaines): 5-10ms
LVC V3 (Base): 10-15ms
LVC V3 (w/all plugins): 20-25ms