AltTab is slow to appear when many windows are open

[mfn]

Using Version 3.1.0 on 10.15.3 (19D76) using a MacBook Pro (15-inch, 2018) 2,9 GHz 6-Core Intel Core i9.

On my endeavor to mimic the HyperSwitch behavior, I set the "Apparition delay" to 0.

Yet it has a noticeable delay before showing me the grid of application. Not just the first time, all the time.

I've HyperSwitch running next to it and, comparatively, it comes up instantly.

In my super-scientific-not-really benchmarking, I would say the delay is about 250-300ms.

How did I came to this number? Apparently, HyperSwitch also has a way to change the delay, it's called "Delay activation for" I've set it to 0. I increased it gradually until I felt the delay matched that of AltTab 🤷‍♀️

I've searched existing issues:

• https://github.com/lwouis/alt-tab-macos/issues/86 (closed due to unspecific, referenced other issues)
• https://github.com/lwouis/alt-tab-macos/issues/45 but I don't want to actually say it's about thumbnail calculation
• https://github.com/lwouis/alt-tab-macos/issues/62 interestingly I would not characterize actual switching as slow, feels as fast as with HyperSwitch

Thanks

Debug profile:

• App version: 3.1.2
• App preferences:
  • NSWindow Frame SUUpdateAlert: Optional(530 476 620 392 0 0 1680 1027 )
  • SUHasLaunchedBefore: Optional(1)
  • SULastCheckTime: Optional(2020-03-12 06:05:47 +0000)
  • SUUpdateRelaunchingMarker: Optional(0)
  • hideSpaceNumberLabels: Optional(true)
  • maxScreenUsage: Optional(80)
  • metaKey: Optional(⌥ option)
  • minCellsPerRow: Optional(7)
  • showOnScreen: Optional(Screen including mouse)
  • theme: Optional(❖ Windows 10)
  • windowDisplayDelay: Optional(0)
• Applications count: 60
• Windows:
  • {isMinimized: true, isHidden: false, isOnAllSpaces: false, spaceId: 1, spaceIndex: 2}
  • {isMinimized: true, isHidden: false, isOnAllSpaces: false, spaceId: 1, spaceIndex: 2}
  • {isMinimized: true, isHidden: false, isOnAllSpaces: false, spaceId: 1, spaceIndex: 2}
  • {isMinimized: true, isHidden: false, isOnAllSpaces: false, spaceId: 1, spaceIndex: 2}
  • {isMinimized: false, isHidden: false, isOnAllSpaces: false, spaceId: 1, spaceIndex: 2}
  • {isMinimized: false, isHidden: false, isOnAllSpaces: false, spaceId: 1, spaceIndex: 2}
  • {isMinimized: false, isHidden: false, isOnAllSpaces: false, spaceId: 1, spaceIndex: 2}
  • {isMinimized: false, isHidden: false, isOnAllSpaces: false, spaceId: 1, spaceIndex: 2}
  • {isMinimized: false, isHidden: false, isOnAllSpaces: false, spaceId: 1, spaceIndex: 2}
  • {isMinimized: false, isHidden: false, isOnAllSpaces: false, spaceId: 1, spaceIndex: 2}
  • {isMinimized: false, isHidden: false, isOnAllSpaces: false, spaceId: 1, spaceIndex: 2}
  • {isMinimized: false, isHidden: false, isOnAllSpaces: false, spaceId: 1, spaceIndex: 2}
  • {isMinimized: false, isHidden: false, isOnAllSpaces: false, spaceId: 1, spaceIndex: 2}
  • {isMinimized: false, isHidden: false, isOnAllSpaces: false, spaceId: 1, spaceIndex: 2}
  • {isMinimized: false, isHidden: false, isOnAllSpaces: false, spaceId: 1, spaceIndex: 2}
  • {isMinimized: false, isHidden: false, isOnAllSpaces: false, spaceId: 1, spaceIndex: 2}
  • {isMinimized: false, isHidden: false, isOnAllSpaces: false, spaceId: 1, spaceIndex: 2}
  • {isMinimized: false, isHidden: false, isOnAllSpaces: false, spaceId: 1, spaceIndex: 2}
  • {isMinimized: false, isHidden: false, isOnAllSpaces: false, spaceId: 1, spaceIndex: 2}
• OS version: Version 10.15.3 (Build 19D76)
• OS architecture: x86_64
• Locale: en_AT (current)
• Spaces count: 1
• Hardware model: MacBookPro15,1
• Displays count: 1
• CPU model: Intel(R) Core(TM) i9-8950HK CPU @ 2.90GHz
• Memory size: 34,36 GB
• Active CPU count: 12
• Current CPU frequency: 2.9 Ghz

[lwouis]

Oh thank you for sharing this other bug!

Indeed I was able to reproduce it on v6.6.0. Good news is that the issue is gone in my local build. I'm waiting for people in #556 to give me more feedback to release that version. When that happens, that bug will be fixed for you.

Could you please test the build I shared there to help testing it before release? My current worry is that some people say that shortcut with the shift key are not working properly.

[jaekyeom]

@lwouis Sorry for the huge delay on my side. In fact, I had downloaded the test build and have been using/testing it. I was going to write a reply at some point, but instead I got totally engaged with some work and thus too busy ;)

This test build indeed solves the original problem I was having! But I think that the key-hold-down-repeat feature is causing some issue, which turns out to be already reported ( #633 ).

[AChangXD]

This issue is still happening when computing previews