Your ping is not okay at all, having such high levels of ping for a long period of time while playing causes many issues to your game alongside with the delayed actions you take. Try to close any applications that might run to the backround like Steam, Windows support, or any other application that might starts any kind of updates automatically.
It might be a problem in server files, did you tried to delete and download it again?
Well, I give it 2-3 days to see if the problem fix you know.. I thought the lag is normal that it will go away in a few days. But, after 3 days still it didnt go away so thats where I start to reinstall MTA and the same issue occur.
The main cause of this problem is your internet connection. There is a lot of traffic going on in your ISP network that is why you're encountering this type of problems. Try to reset your router every now and then. Also, try to remove/close all the background applications that may be running on your system. Just press Win key and search background apps then turn it off (e.g. background downloads, automated updates to games and apps, or browser tabs streaming video or audio.). Close any application in your system tray as well that you won't be using while playing CIT. If it doesn't fix it, go to your router and try different ports, turn off router > re-plugin ethernet cable to other ports > wait 10 seconds > turn it on > and repeat (if it doesn't get fixed). Wish this may solve your problem.
I agree with the ISP traffic thing maybe that could cause it maybe I need to start using LAN cable but I dont want to bcoz I have been using wifi for like 2 years+ and had no issue like this before. Tried resetting the router still same issue occur. Also, I always have antivirus and other windows system running in the background as usual while playing MTA SA in the past but no issue in packet loss until few days ago suddenly I have packet loss not sure why.. is it someone trying to hack me or somethin . Tried different ports still same issue. But, hey im not advertising.. I tried joining different server (not gonna name it) and I see my ping is stable and also I see other player's movement is smooth .. no laggy movement. Maybe my cit files or acc is messed up? idk..Like lucifer said above ping depends on how far or close you are to the main server host location. This ping I have is normal for me and stable connection and its been like that for 2 years ago so no issue with that. I even ask a few person about ping/packet from different country (MY) - Malaysia and (ID) Indonesia that is nearby my country which I live in SG (Singapore) .. they said they have that kind of ping too 170 - 290 range which is normal and they had no packet loss and smooth gameplay. Also, about background apps I dont have a lot of apps running in the background while running MTA .. only antivirus and other windows system.Note: I've merged your posts, no need to double post ~ Rubby
Then the root cause is probably from your internet provider's end and Instead of using wireless connection, use ethernet cable just like lucifer said. I have some more solutions that may help you;Open your MTA, head to task manager > details > right click GTASA > set priority > click Real time.Update your OS. Outdated OS might be the problem because of bugs.Just change your wifi password frequently, since there might be a device that interferes with your connection.I wish these could fix your problem.