Try these fixes:
Method 1 Method 1 of 5: Reducing the Graphics Quality in Roblox
Why These Can Happen
Method 5 Method 5 of 5: Deleting Textures on Mac
If lowering the graphics quality didn't improve the gameplay, check to make sure your device isn't running other high-power apps. If it is, try closing any unwanted apps to make sure they aren't taking up system resources that Roblox may need to run properly.
Lower graphics levels will reduce some of the image/visual quality but it also means that your device works less to run Roblox and may result in a better gameplay experience.
Go to Settings. Under the GRAPHICS section, you can check the graphics level of Roblox. To lower the level, first toggle the Graphics Quality - Auto to disable it. Then make any necessary adjustments to lower your level.
If your Roblox is still laggy, check out for potential error codes that may be found in the log files. If the log files seem fine, it is time to upgrade your device. For any other queries, feel free to comment them below.
Network Lags happen because of one of these 4 reasons: 1 Firewall: Firewall might be blocking some elements. 2 Slow Internet Connection/Big Game: If the connection is slow and the game is really big, it can take up a good amount of time to download the map, resulting in a lag. 3 Empty Game/Place: If the map is unusually devoid of anything, it may not even load. 4 Bad Game/Place: The game may have bad scripts or may have too many objects.
It is important to note that lowering graphics will reduce the graphics visual quality of the game. However, this will ensure that your PC has to work less in order to run Roblox, which will ultimately result in a smoother gaming experience.
Lower the Graphics Quality. To lower the graphics quality setting, click the button with the minus sign (-) next to "Graphics Quality" in the "Settings" menu. This lowers the graphics quality by one bar. The graphics quality is lowest when there is only one blue bar.
Use an ethernet connection. If you are connecting to the internet wirelessly, you can get a more stable connection if you use a wired connection. Connect an Ethernet cable to one of the LAN ports on your modem or router an ethernet port on your desktop computer or laptop.