In reply to a post by alexatkin:

The bigger speed tests have many different servers in the UK which may take completely different routes. So the odds of hitting congestion is much lower.

However, you're only testing to one endpoint for a given test.

In general: you should remember that speedtest.net (Ookla) is paid for by ISPs, and is designed to make your ISP look good. That's why they default to a multi-threaded test with high concurrency; it papers over the cracks of low-level packet loss. And that's why they default to an endpoint which is very close to your ISP, or even inside it.

TBB's speedtest doesn't have that bias, so it gives you a more realistic view of what you might observe in real life when doing a single download.

Multi-threaded is more realistic for an office environment where you have many people using the same link at the same time.

Generally speaking, I find the TBB tests to be very low compared to any other test and frankly real world experiences. especially with faster connections. It's been the case for as long as I can recall.

In reply to a post by adslmax:

What does this https://www.fireprobe.net/gb speed test result for you?

FWIW, I found this to be closer to reality in a few tests I did, but it does usually under-report upload speed.

It's always seemed accurate to me having used it for many years. It has been instrumental several times over the years in uncovering issues with my ISP principally through single threaded results being lower than multi-threaded.

Thankfully since switching to IDNet such things are extremely rare.



If the results are not what you expect my many years of experience tell me that you should be talking to your ISP's support department.

I've found it to be very good lately, previous I would get random results! I'm in N.Ireland so distance can be issue, but last few tests are all great.

Been a while since I tried one.. most definitely the best single thread I've ever had on it..

Seems to work here ok, though I don't know how accurate the single thread is as no one else to my knowledge does a single thread test

fast.com can do it if you manually tell it to.

So, I just tried that as min 1, max 1 and I get 1.7Gbs
Trying min 1 and max 16 gives me same result
Even more confused now

Mine ...