Not Receiving Full Speeds on Internet 75

[wireless]

I recently had my modem upgraded and finally had bonded copper installed. After running a couple of speed tests to my delight I was getting 68.30mbps download and 20.38mbps upload with 4 ms ping on hard wired connection. On 5g I get 68.09down and 20.42up on 19ms ping, and on 2.4g I get 35.23down and 20.47up on 5ms ping. My question is 1.) What is stopping my connection from getting full 75mbps (not that I'm complaining! Happy to finally get close to the speed i pay for!) 2.) Does the 5g connection always have a higher ping ? 3.) And is it common for the 2.4g connection to be half the speed of the plan? Thanks any tips would help!


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