This is an interesting issue which I as well experienced a few days ago.
While using the roblox linked sword, (I was roblox clanning) I found that there was a delay from when I (double clicked) to lunge until it actually lunged. There was a 1-3 second delay which was extremely annoying to fight with. I also noticed that my ping was abnormally high. Hope this can be fixed soon!
(Link to game)
https://www.roblox.com/games/2088996132/UCR-Gemini