Windows 10: BG processes cause keyboard shortcut lag

Update, as of 12/5/15

After considerable experimentation it appears that the lag will occur when a STORE or (system) SETTINGS app (Calculator, for example) or "store" itself is listed in Task Manager background processes. Kill the process, and the lag vanishes. When the app is actually running, it is listed under APPS, not background processes. Then at random times, often after a sleep cycle or at boot, it will spontaneously appear as a background process - Calculator, Store and possibly others.

Speculated causes of this annoyance are discussed in this article and its embedded links... https://superuser.com/questions/426947/slow-windows-desktop-keyboard-shortcuts/957210#957210 where "Helen" posted a workaround...

Disable SUPERFETCH. Click START, type "services", <enter>, double-click on SUPERFETCH. Stop it. Disable it.

No performance hit has been noted by doing so, and shortcuts launched via keyboard no longer lag. Fingers crossed.

:)

 

STORE apps background processes cause keyboard shortcut lag (revisited)

Store-derived apps running as a background process cause a four-second lag when
keyboard input is used to launch any shortcut.

Calculator, as an example, spontaneously appears as a background process, or any store app may invoke STORE in the background, as seen in taskmanager. If either is shown there, a keyboard shortcut launch will lag. When launched manually, calculator does not
appear as a background process, but later - even when not used - it will eventually be listed.

At times there's a lag even without these processes running, but that is infrequent and may occur after rebooting. Lag can be banished by clicking the notification icon or killing the SHELL EXPERIENCE HOST process, which hints that it's related to the problem.
The process restarts spontaneously, but the lag doesn't return until, often, the next boot.

Some posts hint that this issue has been ongoing for years, but it first became evident here in Windows 10. Is there a way to prevent store apps from running in the background? Better still, is there a way to prevent the lag when they do?

 

Lag when using shortcut (keyboard) keys

Update, as of 12/5/15

--- revised 2/18/16 --- No further instances of lag (which can also stop macros from completing) since SUPERFETCH was disabled. However, some users report occasional lag despite this measure, and
the underlying problem is extant.

It appears to have nothing to do with hardware, keyboard drivers, SFC or services other than SF.

After considerable experimentation it appears that the lag will occur when a STORE app (Calculator, for example) or "store" itself is listed in Task Manager background processes. Kill the process, and the lag vanishes. When the app is actually running,
it is listed under APPS, not background processes. Then at random times, often after a sleep cycle or at boot, it will spontaneously appear as a background process - Calculator, (System) Settings, Store and possibly others.

Speculated causes of this annoyance are discussed in this article and its embedded links...

https://superuser.com/questions/426947/slow-windows-desktop-keyboard-shortcuts/957210#957210 where "Helen" posted a workaround...

Disable SUPERFETCH. Click START, type "services", <enter>, double-click on SUPERFETCH. Stop it. Disable it.

No performance hit has been noted by doing so, and shortcuts launched via keyboard no longer lag.