I did realize about the date and i did pushed another update soon after the report (12 april) and few days after. I needed to know the latest server status, whether it's still lagging or not and whether it's less lagging compared to before. It's important to give direct and detailed answer to the questions. I dont really have much time to check after each fix, besides i still dont have much info about the cause, so i just push possible solution to the problem by improving the codes from time to time.
Edit(21/4/2019): Marked as solved as no complaint is recieved after the last fix. If it's still happening, post new report with detailed explanation( such as how many players, is there any running event or anything that could be useful to find the cause of the problem ).