Difference between speedtest.net and Task Manager

[Kestane]

I have 35 Mbps download and 3 Mbps upload speed but I see 33.60 Mbps download and 3.5 Mbps upload on Speedtest.net. Task Manager says 35.4 Mbps download and 3.6 Mbps upload. Why are there differences between them? Upload speed higher than speed plan and download speed low. 

[jctappel67]

There's always a bit of room for error.

 

It's pretty great that you're actually getting what you paid for TBH

[Fried.Bacon]

1. The primary factory is really the update interval. Speedtest is more close to realtime polling, while Task Manager refreshes about 0.8 seconds.

2. Internal communications between you and your network, even NetBIOS traffic is included in TM. Speedtest only measures from your laptop to their servers

 

[Kestane]

1 minute ago, Fried.Bacon said:

1. The primary factory is really the update interval. Speedtest is more close to realtime polling, while Task Manager refreshes about 0.8 seconds.

2. Internal communications between you and your network, even NetBIOS traffic is included in TM. Speedtest only measures from your laptop to their servers

 

So is it results are normal?

[Kestane]

5 minutes ago, jctappel67 said:

There's always a bit of room for error.

 

It's pretty great that you're actually getting what you paid for TBH

On the fiber connection?

[Fried.Bacon]

33 minutes ago, Kestane said:

So is it results are normal?

Yeap, that should be fine. If you're checking your internet speed, then i'd recommend referencing Speedtest net. 
If you want something installed on your computer as a reference, use GlassWire. The free version allows you to monitor specific apps and check who's generating traffic

[Alex Atkin UK]

Task manager may show RAW throughput, including overheads.

 

Speedtest.net (in theory, because I HAVE seen it report strange impossible speeds a few times) is showing you the real-world speed, which will usually be slower than your package,unless your ISP has provisioned your connection higher to accommodate for that.

Fortunately it seems its becoming more common for an ISP to provision you higher than the package you paid for, treating your package figures more as a minimum.  Although Cable pretty much always do that, providers using other technologies didn't use to.

 

[beersykins]

There's actually more data that the NIC/TaskManager sees than the Speedtest.net application sees for the same flow, since you have transport protocols like TCP/IP which attribute to an overhead.

 

Also there's other background processes that contribute to the Task Manager total.