Chopped window moving/resizing for some apps

Bugs or Unexpected Behavior
1

For some apps (e.g. Firefox, Outlook, Slack) the below triggers are causing windows to move/resize choppy:

Move triggers:

[
  {
    "BTTLastUpdatedAt" : 1785503156.1046309,
    "BTTTriggerType" : 1000,
    "BTTTriggerTypeDescriptionReadOnly" : "Leftclick (needs modifier key)",
    "BTTTriggerTypeDescription" : "Move window, works together with the below trigger",
    "BTTTriggerClass" : "BTTTriggerTypeNormalMouse",
    "BTTUUID" : "814B28FE-8BE9-46E0-97B9-C9DEE8301876",
    "BTTTriggerOnDown" : 0,
    "BTTNotesInsteadOfDescription" : 1,
    "BTTRequiredModifierKeys" : 1179648,
    "BTTOrder" : 1,
    "BTTActionsToExecute" : [
      {
        "BTTLastUpdatedAt" : 1777355343.8333812,
        "BTTTriggerParentUUID" : "814B28FE-8BE9-46E0-97B9-C9DEE8301876",
        "BTTIsPureAction" : true,
        "BTTUUID" : "15275932-B4CE-4EFE-B9E2-46A2E923C50F",
        "BTTPredefinedActionType" : 204,
        "BTTPredefinedActionName" : "Activate or Bring to Front Window Under Cursor",
        "BTTOrder" : 0
      },
      {
        "BTTLastUpdatedAt" : 1777355343.8355999,
        "BTTTriggerParentUUID" : "814B28FE-8BE9-46E0-97B9-C9DEE8301876",
        "BTTIsPureAction" : true,
        "BTTUUID" : "20951756-930F-4A9D-A670-0D3363869668",
        "BTTPredefinedActionType" : 69,
        "BTTPredefinedActionName" : "Start Moving Windows",
        "BTTGenericActionConfig2" : "1",
        "BTTOrder" : 1
      }
    ],
    "BTTGestureNotes" : "Move window, works together with the below trigger"
  },
  {
    "BTTLastUpdatedAt" : 1785503156.10566,
    "BTTTriggerType" : 1000,
    "BTTTriggerTypeDescriptionReadOnly" : "Leftclick (needs modifier key)",
    "BTTTriggerTypeDescription" : "Move window, works together with the above trigger",
    "BTTTriggerClass" : "BTTTriggerTypeNormalMouse",
    "BTTUUID" : "3C7FB066-685F-4D43-B603-10FA01456350",
    "BTTTriggerOnDown" : 1,
    "BTTNotesInsteadOfDescription" : 1,
    "BTTRequiredModifierKeys" : 1179648,
    "BTTOrder" : 2,
    "BTTActionsToExecute" : [
      {
        "BTTLastUpdatedAt" : 1777355343.4096961,
        "BTTTriggerParentUUID" : "3C7FB066-685F-4D43-B603-10FA01456350",
        "BTTIsPureAction" : true,
        "BTTUUID" : "8321A117-7052-40F5-A134-7BFD411AB9DE",
        "BTTPredefinedActionType" : 70,
        "BTTPredefinedActionName" : "Stop Moving Windows",
        "BTTOrder" : 184
      }
    ],
    "BTTGestureNotes" : "Move window, works together with the above trigger"
  }
]

Resize triggers:

[
  {
    "BTTLastUpdatedAt" : 1777355344.0617919,
    "BTTTriggerType" : 1000,
    "BTTTriggerTypeDescriptionReadOnly" : "Leftclick (needs modifier key)",
    "BTTTriggerTypeDescription" : "Start Resize with leftclick, shift and option, works together with below trigger",
    "BTTTriggerClass" : "BTTTriggerTypeNormalMouse",
    "BTTUUID" : "A94520F2-7284-422D-B17C-AAA3AE8E9778",
    "BTTNotesInsteadOfDescription" : 1,
    "BTTRequiredModifierKeys" : 655360,
    "BTTOrder" : 3,
    "BTTActionsToExecute" : [
      {
        "BTTLastUpdatedAt" : 1777355344.0642819,
        "BTTTriggerParentUUID" : "A94520F2-7284-422D-B17C-AAA3AE8E9778",
        "BTTIsPureAction" : true,
        "BTTUUID" : "BEF89467-DF02-4173-AE51-1E689541C103",
        "BTTPredefinedActionType" : 204,
        "BTTPredefinedActionName" : "Activate or Bring to Front Window Under Cursor",
        "BTTOrder" : 0
      },
      {
        "BTTLastUpdatedAt" : 1777355344.0667958,
        "BTTTriggerParentUUID" : "A94520F2-7284-422D-B17C-AAA3AE8E9778",
        "BTTIsPureAction" : true,
        "BTTUUID" : "B2359A69-F6D8-4891-B3BD-3E0842CB97E8",
        "BTTPredefinedActionType" : 71,
        "BTTPredefinedActionName" : "Start Resizing",
        "BTTOrder" : 1
      }
    ],
    "BTTGestureNotes" : "Start Resize with leftclick, shift and option, works together with below trigger"
  },
  {
    "BTTLastUpdatedAt" : 1777355343.5642591,
    "BTTTriggerType" : 1000,
    "BTTTriggerTypeDescriptionReadOnly" : "Leftclick (needs modifier key)",
    "BTTTriggerTypeDescription" : "Stop Resize with leftclick, shift and option, works together with above trigger",
    "BTTTriggerClass" : "BTTTriggerTypeNormalMouse",
    "BTTUUID" : "2A6E0870-1669-4937-87B3-AF8057B4E4A7",
    "BTTTriggerOnDown" : 1,
    "BTTNotesInsteadOfDescription" : 1,
    "BTTRequiredModifierKeys" : 655360,
    "BTTOrder" : 4,
    "BTTActionsToExecute" : [
      {
        "BTTLastUpdatedAt" : 1777355343.566118,
        "BTTTriggerParentUUID" : "2A6E0870-1669-4937-87B3-AF8057B4E4A7",
        "BTTIsPureAction" : true,
        "BTTUUID" : "2AEAA3EE-3C23-490F-A70F-EA17DA2A3575",
        "BTTPredefinedActionType" : 72,
        "BTTPredefinedActionName" : "Stop Resizing",
        "BTTOrder" : 186
      }
    ],
    "BTTGestureNotes" : "Stop Resize with leftclick, shift and option, works together with above trigger"
  }
]

I don't have snap areas feature enabled. Using

image
image1572×1046 108 KB

results in the same behaviour.

Pretty sure that this was not the case in some of the previous versions.

Some smooth moving/resizing apps: BeyondCompare, draw.io, Safari, BTT, DBeaver

BTT: 6.687
macOS: 26.5.2 25F84

2

Most likely it is also choppy with the standard moving settings, can you verify that on your system?

image
image1920×1339 205 KB

BTT needs to use the accessibility API to move windows, and the smoothness depends on how well the apps handle that. Most native apps do well, but cross platform can sometimes cause issues.
However I don't think there has been a change in this area for a long time, have you already tried to restart your machine? Sometimes the window server gets into a weird state that can also cause this.

3

Thanks Andreas, I was expecting this - "but cross platform can sometimes cause issues", but since the "smooth moving/resizing apps" are also cross platform (without Safari) I've opened this topic. However I have a questions - does someone else (or your personally) also experience this?

I need to mention that using the title bar to move the windows OR using the edge of the window to resize the windows works smoothly (but maybe this is because this does not use the accessibility API).

About the "standard moving settings" - I've tried with them but still the same.

4

yep titlebar is different, that should always be smooth.

Accessibility can be influenced by a lot of things mostly the general system load but also window server issues. I just tried Firefox and outlook on my system and both a smooth.

Do you maybe have any accessibility related apps installed? One thing that always causes high accessibility load is tools that enable AXEnhancedUserInterface property on apps, this is usually done by screen reader apps but also some utilities

5

I just remembered we had discussed AXEnhancedUserInterface in relation to the Homerow app. Are you still running that?

Possibly quitting that app and then relaunching Firefox would tell us whether the choppiness is caused by that

6

Now that you have mentioned that (AXEnhancedUserInterface) I remembered about Homerow (which is stopped for few days now), but Firefox wasn't restarted, so I've just restarted it and now moving/resizing is working smoothly.

I was too quick in my response. Only for a short period of time it was working OK, and now it is again choppy :\ .