As others have pointed out, it is very, very unlikely that your access point hardware is a realistic candidate to be the bottleneck.
The possible bottlenecks are
your router / access point -- so unlikely it's not even worth considering, frankly, unless the hardware is literally broken with wires poking out of it.
wireless signal quality -- if it's low enough, it will be slower throughput than your ISP. It'd have to be terrible though. Can happen, though, depending how sketchy the wireless signal is from your current location.
your ISP's bandwidth -- for most people, unless you have a ridiculously crazy stupid fast internet connection, I can safely say how much bandwidth your ISP provides to you will be the bottleneck for transferring files over the internet.
Bottom line, do some file transfers and see. If you want to rule out your ISP and test wireless signal quality, just copy a file from one WiFi connected PC on your network to another WiFi connected PC.