I wonder is it wise to turn off firewall on wifi router for better internet download speed since win10 has built in firewall ?
The wifi router is only share by a computer and mobile phone.
You aren't going to see any difference in download speeds by turning off any firewalling features on your router. Leave it enabled.
If you delete all your firewall rules you will not have internet at all
firewalls block all unsolicited connections by default but it also contains rules to allow network traffic,
Leave it on.
Read this for a better understanding of why you should leave it on. If it has an easy way to turn it off/on, you can turn it off and do a quick test to confirm your download speed will be insignificantly changed, if it all. Don't forget to turn it back on if you decided to experiment.
Should I Enable the Firewall In My Router? - Ask Dave Taylor
If you need better internet speed, then that’s up to your ISP’s internet plan. Just upgrade your internet plan for better speeds from your ISP.
Quote