Extreme lags when go any source of water especially ocean and lag in world generation

It lags toooo much pleas remove it or tell me a texture pack that can remove the lag .The lag happen when the player is near the ocean or swimming in ocean and when the world is generating chunks. Please please please please fix this problem. I beg you. The phone that I have is Huawei RIO-L01. You guys didn't have the device that I have.