Redmi Note 9 runs on a Helio G85 SoC, backed by 4GB of RAM and 128GB of storage. This processing package should be more than enough for the usual day-to-day tasks, even a bit of light to moderate multi-tasking. Those who use a ton of apps at the same time may opt to look for another device with more RAM.
The phone can run Mobile Legends at its highest settings with HFR Enabled and Asphalt 9 on its default setting with no issues. CoD Mobile will run at Medium + High FPS, but I do suggest dialing the settings down a bit for a better experience.