Wifi issues with multiple devices
The 100/24 Mbps are actually good numbers.

The question is are those actually arriving at your computer.

One suggestion I would make is for you to switch to 5GHz router/Network.

That should eliminate lots of neighborhood interference.

5GHz also has much higher data transfer rate between your router and your computer.

On Mac the Transfer Rate is shown in the WiFi profile and it is the one key measure how fast is your connection to the router.

My Transmit Rates are 70 on a 2.4 GHz network and 250 on my 5 GHz network.

PS, try turning off the dual frequency on your Router.