If I get 45 Mbps with my wired internet connection...
 

and 30 Mbps when Im using wireless, why don't I get 75 Mbps when I use them both at the same time on the same computer?

If a cat can run 10 miles per hour and a dog can run 15 miles per hour, why can't they run 25 miles per hour if they're strapped together?

Apples and oranges. Two different breeds. This is the same internet, from the same provider - Totally different.

The consequence of no concurrency.

So you just answered your question

try dual wan router. mine supports upto 4 wan connections.,

so you can get 45 mbps * 4

Bit like asking if you drive a car and ride a bike simultaneously whether you can get there faster. :thumbsup

By wireless I presume you mean mobile/3G/4G/5G? As freecartoonporn says, it may be possible to find a router which supports more than one WAN connection, but be aware that it will not be able to route a single stream over both connections, so you will only see speed benefit if you have at least two streams going concurrently. Whether your provider actually allows this is also something to find out.

you missed the point.

A cat and dog will run zero miles per hour if they're strapped together.

Because they're strapped together.

What ghjghj said. Consequence of no concurrency. Shit doesn't work like you think it does.

Replace the RJ45 cable with a Gigabit-cable - its a cheap upgrade to gigabit interwebs. Your ISP cant see the difference and wont charge you extra #LifeHack

You used to be able to get 2 connections into your house and bridge them together for near double-speed. I haven't tried it since the old days but it may still work. Go to youtube and google Linus Tech Tips as he has something on this.

question, why do you only get 30 through wireless, such a huge drop between wire and cable...

We´ve always had around the same, obviously wireless can be a few mb or possibly 5mb difference, but 15... big chunk being used else where i´d have suggested :2 cents:

I got 150 mbs with comcast wifi