Uploading anything slows the entire connection down for all

If I upload a video to Youtube, files, photos to backup to Google Photos or music etc the internet connection on all other devices becomes unworkably slow until the upload finishes. Not just a bit slower but stupidly slow. It is only me using the connection of a few devices. I haven't activated an QoS rules that I know of.

I other ADSL connections I've had can cope with a household of devices doing multiple things at the same time. I struggle with just one.

Saturating the upload can cause download and its ACK traffic to be delayed and slow down downloads.

Different router hardware copes with this in different ways, the usual solution is to implement some QoS at the router, or limit the upload application to only use 80 to 90% of the upload capacity.

In reply to a post by firefusion:

If I upload a video to Youtube, files, photos to backup to Google Photos or music etc the internet connection on all other devices becomes unworkably slow until the upload finishes. Not just a bit slower but stupidly slow. It is only me using the connection of a few devices. I haven't activated an QoS rules that I know of.

I other ADSL connections I've had can cope with a household of devices doing multiple things at the same time. I struggle with just one.

My connection speed is good it being Saturday...
For connection to BBC iPlayer and YouTube I do find the Upstream speed is critical and needs to be at Maximum Upstream 1272 (Kbps) if it drops to say 600 (Kbps), the connection will crawl still with the Downstream 11623 (Kbps).

ADSL Status
This page shows information about your ADSL connection if applicable.
Status
Configured Current
Line Status --- SHOWTIME
Link Type --- Interleaved Path
Operation Mode G992.5(ADSL2+) G992.5(ADSL2+)

Data Rate Information
Stream Type Actual Data Rate
Upstream 1272 (Kbps.)
Downstream 11623 (Kbps.)

Defect/Failure Indication
Operation Data Upstream Downstream
Noise Margin 5.4 dB 9.4 dB
Line Attenuation 15.9 dB 29.5 dB

Indicator Name Near End Indicator Far End Indicator
Output Power 12.6 dBm 0.0 dBm
Fast Path FEC Correction NA NA
Interleaved Path FEC Correction 3847 0
Fast Path CRC Error NA NA
Interleaved Path CRC Error 30 8
Loss of Signal Defect 0 0
Fast Path HEC Error STR NA NA
Interleaved Path HEC Error 696 10
Error Seconds 23 6

Statistics
Received Cells 4370394
Transmitted Cells 740778