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I have the problem described in the question. There was the same question on quora a year back, however, none of the proposed answers - which were more about what might be going wrong than how to repair the situation - did go in any direction that would help me.

My system:

  • Ubuntu 18.04.1 LTS, 64 bit
  • 64 GB of RAM
  • intel core i7 6700K CPU 4 GHz x 8

I have given 32 GB of RAM and 4 Processors to the virtual machine.

When the ubuntu box is started, the windows guest runs smoothly and fast. Over time of the uptime of the ubuntu host, the guest system slows down - in my opinion, this slowing down process is linked to the uptime of the host, not the runtime of the guest.

I checked that:

  • RAM consumption on Host and Guest are low (i.e., plenty of ram left on the host and the guest nearly not consuming anything)
  • CPU consumption low on Host and Guest

I am working with snapshots that I perform regularly. Making snapshots does not speed up the guest.

I am often completely shutting down the guest and restarting (both using ACPI shutdown and reset). Not speeding up the guest.

I am completely unable to pinpoint why the guest would be slow.

I can provide the VM logs as I am unable to use them myself (I have no idea what I might be looking for).

Any help would be appreciated - note that the obvious "workaround-solution", restarting the host, is not an option as I have long-running processes on that machine that I do not want to interrupt.

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    Prescribing a solution without clearly understanding the problem seems unwise. My Windows VM Guest does not seem to slow down, running happily and fast day after day.
    – user535733
    Oct 28, 2018 at 19:56
  • in my opinion, this slowing down process is linked to the uptime of the host, not the runtime of the guest. One way to test this hypotheses is to shutdown the VM and starting it again while in the same Ubuntu session. Have you? What were the results?
    – user880592
    Oct 28, 2018 at 19:58
  • I do not have an exact quantification of the slowness of the system. Most of the time, the guest is not running. I only start it sporadically when I need to edit ms office documents or program some VBA. Whe I write that "in my opinion..." I mean that there was a jump in slowness between instances of running the VM (about one week apart). A week ago, the Guest was reasonably fast, now it is not. This behaviour is reproducible, it happened several times (several boots of the Ubuntu host).
    – user142295
    Oct 28, 2018 at 20:02
  • And yet you are of the opinion that the slowness (doesn't matter how much) of the VM Windows is linked to the uptime of the host without actually testing it? The test is simple as I suggested above.
    – user880592
    Oct 28, 2018 at 20:04
  • OK, I thought that I did perform the exact test that you suggested. Timepoint A (one week ago): guest is OK. Then shutting down the guest. Timepoint B (now): starting VM with windows guest. Guest is slow
    – user142295
    Oct 28, 2018 at 20:06

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