Yes, linking two Wi-Fi devices to a switch can improve your internet performance.
Yes, linking two Wi-Fi devices to a switch can improve your internet performance.
You can link both routers together using a single cable from each to the switch, then connect the other end of that switch to your computer.
You can link two network cards, one for each router, using tools like Speedify. Each router should have a different LAN IP range. However, this approach is unlikely to be effective for just 1Mbit. Merging a slow and fast connection usually doesn’t yield good results.