It is a command-line tool that is often updated faster than GUI tools when YouTube changes its platform. [Solved] Sudden slow download speeds - Appwork GmbH

If any entries have a yellow arrow on the far right (indicating they were changed), click it to reset them to default. 4. Update the Core and Plugins

JDownloader fails to properly handle IPv6, leading to poor connection routing.

Some ISPs throttle traffic to popular streaming sites, particularly during peak hours. Alternative: When JDownloader 2 Fails

If your IPv6 routing is bad, forcing IPv4 can fix speed issues. Go to -> Advanced Settings . Search for InternetConnectionSettings.preferredipversion . Change the setting from SYSTEM to IPV4_ONLY or IPV4_IPV6 . Restart JDownloader. 3. Reset YouTube Plugin Settings Go to Settings -> Advanced Settings . Search for Youtube .

Sometimes the issue is restricted to a specific YouTube video or container. Phase 2: Advanced JDownloader 2 Configuration