: Use root access to delete system apps like Asus ZenUI services that slow down the 2GB RAM.
If you want to move forward, I can help you find the specific ADB commands to remove the laggy Asus apps, or I can look for the latest TWRP recovery image link for you. Would you prefer to try rooting the current software or are you set on finding a full ROM replacement Asus Zenpad 10 Z300c Custom Rom
Would you like a detailed walkthrough for your stock firmware instead? : Use root access to delete system apps