Hi @Md_Moshiuzzaman and welcome! Your project works fine on my mobile (iPhone 14 Pro). Where or when do you see the lag and what kind of mobile do you use?
If you want it to run on lower end devices you should bring down your draw calls. I see it at 175 draw calls at the moment. No strict rule here, but you want it to be around 40-60 then.
Many mesh instances, that could all be a single mesh: