I quickly tested it with an FTP server set up to a read only folder with a single dummy file. You could put a big file so you can check the speed, at home it will use the full speed, while away it’ll use the cap of your ISP tier.
If you want a more complicated set up I recommend you setting up PiHole and configure magicDNS, this way you can check the difference of getting ads in some sites vs PiHole blocking them.
As @pacology mentioned, tailscale automatically routes traffic through the shortest route, so at home it’ll connect devices directly, this way you only point to your tailscale ip and forget about the 192.x addresses.