Weird drop in fps while driving a car

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#1

hi!
I’m creating a racing game and I ran into a strange bug which is probably caused by physics.
(I’m using heavily modified achassis 1.3)

When driving a car, I feel the fps drop even though they oscillate between 59-60.
(CPU: 16.5-18.8ms and GPU~6ms)

Physics and render ~12%

Looking into the microprofiler, empty frames appear.

It’s hard to assess what exactly affects it because it happens randomly, sometimes immediately after getting into the car and sometimes only after a few minutes of driving.

Game:

If anyone needs more information, just write and I will try to answer as soon as possible.
thanks!

#2

I think because of the attachments and stuff that cause lag in the car when you move. I work with a friend of mine and he also working on cars, when I open my studio and start to work for him, the car was also the reason that cause the server to laggy and FPS drop. I think when you drive the attachment have some movement and cause the game to lag…

#3

the car has only 8 attachments(2 per wheel) and the whole model of the car has completely different collisions than the tires, so they probably have no effect

RobloxScreenShot20230118_143729705 (2)

#4

There must be some reason that makes the game laggy:

1 - There are too many Objects in the game
2 - Your internet is slow or weak
3 - Physics in the game

#5

I think when you move the car, it make a lot of movements and stuff and that is why it cause lag

#6

There are 176 parts that move
image

#7

Yes, I think that is the reason that causes your game is laggy. 176 parts is a lot and you move the car repeatedly at a fast speed!!

#8

after deleting the entire car model, there are ~60 parts left and the problem still occurs

#9

I noticed that if the car drives on asphalt, the lags are more frequent than it would go on Plastic.

#10

I’m sorry if I don’t know much about this, The texture and material can also cause lag so ye :slight_smile:

#11

ok thanks for your help
I’m trying to find a problem in a Customphysical material.

#12

No problem, thank you for spending time!! :smiley:

1 Like
#13

Hi, I drove the car around for 5-10 minutes and didn’t notice a single frame drop.

Can you send a video of what you mean?

most lag ive added to a game is as a result of a memory leak (binding events and not cleaning it up) I don’t think that would result in random dropped frames but idk

1 Like
#14

I think @matikros2005 graphic setting is too high or the graphic mode is automatic. Would you please show us your graphic setting in Roblox @matikros2005??

#15

graphics max.
PC:
i5-9g
1660ti
8gb 2666

I mean the game stays at 60fps all the time.
but sometimes when moving the camera there is a feeling of frame drops can it also be caused by my screen or mouse?

#16

I think it’s just roblox desyncing with the monitor (if you have a 60 hz monitor that’s prob it) (it happens to me all the time lol)

try unlocking your fps to 75 and see if it’s smoother

(edit: same specs as me lol :P)

#18

there is a slight improvement, I think it’s a problem with the monitor, thanks for the help

#19

the problem was dust in the laptop. after cleaning the whole laptop, the game works much better.

#20

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