"Efficiency Mode" Unnecessarily Slows Download to a Crawl

JcW32 290 Reputation points
2026-10-13T23:16:03.5+00:00

In Windows 11 Pro (26H2) on a new PC with plenty of power I recently requested a large download via Chrome. Although Task Manager showed no resource issues with other tasks, "Efficiency Mode" was turned on for Chrome (and two other programs) and the download proceeded glacially, taking more than an hour!

It appears that Task Manager offers a way to turn "Efficiency Mode" on or off -- there is a button for this next to "End Task," greyed out in my case -- but this did not work for me. Too late for me now, but is it necessary to run Task Manager as Administrator for this to work, or does it never work?

Windows for home | Windows 11 | Performance and system failures
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  1. Jeronimo Fuerte 46,760 Reputation points Independent Advisor
    2026-10-14T01:00:50.1166667+00:00

    You do not normally need to run Task Manager as Administrator to disable Efficiency Mode for Chrome processes running under your own account. The option being greyed out at the main Chrome entry is expected because Task Manager generally cannot change Efficiency Mode for an entire process group. Individual processes must be selected instead.

    However, there are three important points worth clarifying:

    1. Chrome can enable efficiency-related settings automatically. Consequently, the green leaf indicator may reappear even after you manually disable Efficiency Mode.

    The change is not necessarily permanent. Closing and reopening Task Manager does not restart Chrome or its processes. To determine whether your changes persist, you would need to completely close Chrome, reopen it, and check the processes again.

    1. Efficiency Mode does not directly impose a network bandwidth limit. According to Microsoft, it primarily affects CPU scheduling priority and power efficiency. Although this could indirectly affect a download under certain circumstances, the green leaf indicator alone does not establish that it caused your unusually slow download.

    Regarding your question about identifying Chrome's individual processes, Chrome has its own Task Manager. It identifies browser tasks, tabs, extensions, and other processes, making it easier to understand what each one does.

    If you encounter the issue again, I would recommend comparing download speeds with Efficiency Mode enabled and disabled, ideally using the same download source under similar network conditions. This would help establish whether Efficiency Mode is actually responsible or whether another factor, such as the download server, network connection, or disk performance, is limiting the transfer.

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  2. JcW32 290 Reputation points
    2026-10-13T23:43:26.1966667+00:00

    The AI "Answer" here may or may not be correct. I tested it on Chrome running as a Standard User by turning off the green-leaf symbols on each of the (many!) Chrome sub-tasks showing it. This resulted in the leaf's disappearing from Chrome itself, and the condition persisted through stopping and re-starting Task Manager.

    What I don't know is whether this trick would have done me any good in the aforementioned large download; nor do I know whether or not it will persist between instances of Chrome, since I'm writing this "answer" from within Chrome right now.

    In particular, I have no idea how do determine what the individual sub-tasks actually do, so it does may not have general applicability.

    Comments and/or corrections welcomed, especially from non-AIs!

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  3. AI answer

    2026-10-13T23:16:16.9533333+00:00

    The Task Manager Efficiency mode control does work only for supported individual processes. It is not available for most process groups, and when it is unavailable the button appears greyed out. For a grouped app, the process group must be expanded and the setting changed on the individual process instead.

    To turn it off for a process in Task Manager:

    1. Open Start, search for Task Manager, and open it.
    2. Go to the Processes tab.
    3. If the app is shown as a process group, select the right arrow to expand it.
    4. Right-click the individual process and select Efficiency mode to turn it off.
    5. When it is turned off, the green double-leaf icon disappears.

    What the available guidance confirms:

    • A greyed-out Efficiency mode button means it is not available for that process group.
    • Windows Task Manager cannot turn efficiency mode on or off for most process groups.
    • The documented steps do not state that Task Manager must be run as Administrator to use this control.

    Also, the Efficiency mode shown in Windows Task Manager is a Windows 11 feature, separate from Microsoft Edge’s own efficiency mode.

    AI-generated content may be incorrect. Read our transparency notes for more information.

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