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3 Posts

10-02-2019

HR

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C740 Alt+Tab very slow

2019-10-02, 17:59 PM

I have yoga c740 14" i7/16/512GB model.

Often(60% of the time) when I alt+tab there is a delay of second or two before the window switches and it's painfully slow. It happens with laptop keyboard and external keyboards and it happens only when using alt+tab, but if I use finger gestures on the touchpad for switching windows it works flawlessly. It is slow only when using the keyboard shortcut. 

It has nothing to do with focus assist since it's turned off for me (mentioning this since almost every post about alt+tab lag on google mentions focus assist)

All drivers and software on my pc are up to date.

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3 Posts

10-02-2019

HR

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Re: C740 Alt+Tab very slow

2019-10-05, 12:44 PM

So I'm responding to myself since I found what's causing the problem and how to temporarily fix it.

So the problem was caused by process Lenovo.Modern.ImController.PluginHost.exe (easy to spot when sorting by CPU usage in task manager)

After ending the process the machine is lag-free but since I don't know what is this used for I wouldn't call this a solution to my problem.

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2 Posts

10-08-2019

MY

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Re: C740 Alt+Tab very slow

2019-10-08, 2:30 AM

It happened to my Lenovo Y530 gaming laptop too. Killing the process did improve the speed. But it will come back again after awhile.

It looks like it was due to the Lenovo System Interface Foundation driver issue. Uninstalling the driver seems solve the issue. But you can't run other Lenovo software like Vantage etc. But to me, I m fine with it as I don't need. The alt+tab slowness really annoying.

 

Fyi, my Lenovo System Interface Foundation version at this time is 1.1.18.1, latest. Hope they can fix the bug.

 

To uninstall the driver:
https://support.lenovo.com/us/en/solutions/ht506070?gclid=EAIaIQobChMImYSYk8-L5QIVgx0rCh2vdQELEAAYASAAEgLCEfD_BwE

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1 Posts

07-26-2014

US

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Re: C740 Alt+Tab very slow

2019-10-09, 19:39 PM

This also happened to my Legion Y7000. The driver uninstall solution given by kentlee87 worked perfectly for me; thank you! I never realized how many times I Alt+Tabbed in a day until it took me .5-1.0s to do so each time.

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1 Posts

10-28-2019

SG

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Re: C740 Alt+Tab very slow

2019-10-28, 7:36 AM

I just bought the new S740 and I'm facing this problem too. Uninstalling the driver did help as well. 

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2 Posts

10-29-2019

BR

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Re: C740 Alt+Tab very slow

2019-10-29, 12:48 PM

I've created an account just so I vould say this: THANK YOU. I've been looking for an answer for weeks and was losing hope when I found yous anwer. Thanks a lot bro!

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2 Posts

10-29-2019

BR

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Re: C740 Alt+Tab very slow

2019-10-29, 12:59 PM
Thank YOU, sir as well. Now I won't have to end the task every time I log into my laptop. Thank both of you
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7 Posts

11-16-2019

US

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Re: C740 Alt+Tab very slow

2019-11-16, 1:35 AM

My ideapad S740 has the same issue. 

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2 Posts

10-08-2019

MY

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Re: C740 Alt+Tab very slow

2019-11-16, 5:32 AM

It seems like they have updated new version of this driver:

https://support.lenovo.com/us/en/downloads/ds105970

 

For those guys facing this problem and did not uninstall the driver, could try update the driver see if it fixed the issue.

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1 Posts

11-17-2019

DE

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Re: C740 Alt+Tab very slow

2019-11-17, 21:23 PM
No it doesn't seem to fix the issue.
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599 Posts

05-24-2018

CA

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Re: C740 Alt+Tab very slow

2019-12-07, 20:24 PM

What does Alt+Tab do?

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2 Posts

12-29-2019

US

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  • Message 12 of 12

Re: C740 Alt+Tab very slow

2019-12-29, 1:18 AM

like one member said, i made the profile to say thank you. killing those .exe solves the purpose. i called their number but seems they r useless people. they are like "Send the laptop and we will look". like seriously, this is a new laptop, i5 processor, just take the remote control of my system and do your thing. 

 

I have one more question though - any lead is appreciated

I have disabled hotkeys thru BIOS, not a fan of pressing fn button and f2 together for rename, but this home (left arrow) button killing me. I don't wanna press shift+fn+home. why Lenovo merged left arrow+home/ right arrow+end, together.

 

any idea how to kill this, my fingers are used to shift+home, i want to eliminate fn key

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