Extremely laggy text input on LinqPad 9

Veleek
Veleek
in General

Since upgrading to LinqPad 9 I've been having extremely poor performance when entering text even for the simplest scripts. Additionally, the CPU goes up to about 10% for LinqPad (with an overall CPU usage of 15%, so NOT under any real load).

Has anybody else experienced this? Is there some setting I can change to improve the performance?

(I've got a video clip of it in action, but I don't seem to be able to post it)

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  • Veleek
    Veleek

    Looks like it wouldn't accept the .mp4 file, but here's a zipped version.

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  • Veleek
    Veleek
    edited July 23

    Found this other thread that recommended internal profiling, so here's a profile of the issue occurring and then also a profile of LinqPad8 which doesn't show the issue.

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  • JoeAlbahari
    JoeAlbahari

    The render thread / DWM composition path on that machine is pathologically slow at window-level updates.

    A few questions:

    1. Is this a local session or remote (RDP/Citrix/etc)?
    2. What the display adapter shows in Device Manager/dxdiag? Does updating your GPU drivers help?
    3. Does the lag disappear with just a single monitor connected?
    4. Does the lag scale with LINQPad's window size?
    5. Has GPU acceleration been disabled, and if so, does it help to re-enable it?

    The difference with LINQPad 8 will most likely be that LINQPad 8 used Windows Forms (Win32) to render the editor rather than WPF, for which there exists a different set of conditions that affect performance.

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  • Veleek
    Veleek
    edited July 24
    1. This is on an RDP connection to a remote VM rendering to my 3 local monitors.
    2. Display Adapter shows "Microsoft Remote Display Adapter", I believe the drivers are reasonably up to date.
    3. Behavior is definitely better when RDPing in with a single monitor.
    4. I would say that yes it definitely feels like the lag is better when the window is smaller.
    5. Acceleration is currently enabled.

    A bit of additional context. I remote into a VM from home (where I have 3 monitors) and from work (where I have 2 monitors). From home, the behavior is definitely worst which makes sense, but even from the office where I'm still RDPing into a VM it's noticeably poor when using the 2 monitor RDP connection.

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  • JoeAlbahari
    JoeAlbahari

    Try the 9.10.10 beta:
    https://www.linqpad.net/linqpad9.aspx#beta

    If it doesn't improve performance, go to Settings and set RDP GPU acceleration to ON.

    If it still doesn't improve performance, it might be that your network lacks bandwidth - is there anything you can do to improve this?

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