Knowledgebase:
Slow download speed
Posted by pspzockerscene psp, Last modified by pspzockerscene psp on 19 August 2021 04:41 PM

Slow download speed

This is a troubleshooting guide about download speed.
In general, bad download speed is not any kind of error of JDownloader but either a user error (bad configuration, bad connection) or caused by the users' ISP, a host-side issue such as temporary server issue or a host-side limitation.

This guide will try to help you to find out why your download speed is bad and how to possibly improve it.

In all cases, you should always compare the speed in JDownloader vs. the speed in your browser by downloading the SAME file over the SAME service with the SAME account(s) in the SAME period of time.
If you are using a proxy/VPN in JDownloader, make sure you're using that in your browser too if you want to get meaningful test results.
In a lot of cases you will notice that the speed you get via browser is the same you get via JD which would indicate server issues/slowdowns of the service you are trying to download from.

Slow download speed when downloading from video/streaming websites?
Some video streaming sites have bandwidth limits in place - especially those that do not provide any comfortable ways to download their content e.g. a download button on their website.
They're basically limiting the max. download speed somewhere near the max. bandwidth of the currently streamed video quality.
This ensures that users who stream the video can do so without any lag and prevents bandwidth bottlenecks caused by users who are downloading streaming content.
In such a case there is nothing you can do about it.

Slow download speed because of too low connection settings?
Check your connection settings!

High CPU usage during download?
Check for potential SSL related issues!

Are other users having similar issues?
Check the JDownloader forums and search the web.
If other users have reported similar issues recently, the issue is most likely not on your side.

  1. Did you enable a speed-limit by mistake in JD? (Speedgraph does show a red line for enabled speed-limit)
    Picture of speedgraph in the top right corner with the red "limit" line, visible while downloads are running:

    - Make sure that the pause button is disabled: It is right next to the "start downloads" ("play button symbol") button
    - Make sure that you did not enable a speed limit by mistake: See Speed limit and Pause mode settings
  2. Did you forget to add your premium account?
    If you own a premium account for a certain service, you should add it under Settings --> Account Manager --> Add
  3. Did you disable your premium account by mistake or is there an error-state on it?
    If you've added a premium account for a service, make sure it is activated under Settings --> Account Manager
    Also check for temporary errors (= account gets displayed in color yellow) or permanent errors like invalid password which would display the account with a red background.
  4. Did you globally disable premium by mistake?
    In the main toolbar there is a symbol with a yellow lock.
    This globally enables/disables all premium accounts - make sure it is enabled!
    Screenshot:
  5. Are you a premium user but JDownloader fell back to free account download for some reason?
    First answer these questions:
    Did you get a captcha, a pre-download wait time or are you only able to start one download at the same time?
    If you can answer some- or all of them with yes, add an account usage rule for the website you're trying to download from and try again.
  6. Does your firewall/AV scanner block JDownloader?
    Make sure that your firewall does not block JDownloader in any way.
    You can check this e.g. by completely disabling it - deactivating it might not always turn it off completely.
    If you are using the firewall of your OS only (e.g. "Microsoft Defender") however, it is enough to temporarily disable it for testing.
  7. Do you use a VPN/proxy for downloading?
    VPNs can become a bottleneck when downloading.
    Turn it off and try again! In some cases though, a VPN/proxy can actually be the solution (see point 8 "routing issues").
  8. Does your ISP have issues?
    There are various speed test websites out there - grab one and test the max. speed you're currently getting via your ISP.
    Your issues might as well be caused by routing issues so better test with multiple different speed test websites.
    In the case of routing issues, using a VPN may even improve your download speed so you may try again using a VPN.
  9. Does the service you want to download from have server/speed issues?
    Search the web to find out if there are currently any reported issues with the service you're trying to download from.
    In this case you would definitly have to contact the websites' support - the JDownloader support will be unable to help solving issues which 3rd party services are having!
  10. Is your issue connected to the device you're currently using?
    Test the same file via the same account with the same proxy/VPN on other devices in your network to find out if your issue is e.g. related to the device you are currently using.
    If you're on a shared network (university network/company network), maybe the overall load is high.
    If your device is connected via WIFI, connect it via LAN cable and see if you get better speeds then.
  11. Does the issue only happen with a specified file?
    Check if you can reproduce your issue no matter which file you are downloading (download files from the same website).
    In some cases, some files might be stored on overloaded servers so out of many files you may try to download, only single files have a slower download speed.
    In this case all you can do is wait or accept the low download speed.

Only contact our support regarding speed issues, if:
- Speed in browser- and JDownloader are clearly different
- You've gone through this troubleshooting guide and were unable to identify any other causes of your speed issues other than JDownloader



Attachments 
 
 downloads_quicksettings_speedlimit.png (35.36 KB)
 toolbar_globally_enable_disable_premium.png (17.90 KB)
 speedgraph_with_speedlimit.png (3.03 KB)
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