I have been facing slowness in the app download and installation from Google play store on my Galaxy S20 FE 5G. Download speed goes as low as 400KB/s even when my internet support speed of 10MB/s. For some apps it is fast while others take more time. In some cases it will be fast initially then gradually go down. Never faced such issue on my old OnePlus device. App installation also take a lot of time even for small apps from the google play store. I am on OneUi 3.1 with June security patch.