Galaxy M
We have a lot of available Launchers that can be downloaded in the Play Store, but me myself, I'm still sticked with using the One UI Home launcher. Here are my tips to optimise the launcher: 

On Recent tasks interface: 
• Turn off app suggestion 

• Go to settings > search Usage Data Access > Turn off data usage access for One UI 

• Go to settings > Accessibility > Visibility Enhancement > Reduce transparency and blur

This optimisation is particularly useful to those who are using entry-level and midrange level Galaxy devices. 

If you have additional info, feel great to drop it in the comment section below. 

Hope that helps !