Guest unusable slow after deleting snapshots

[lsimma]

Hello

I deleted three snapshots. After the merge the windows guest is now unusable slow.
Startuptime before was 30sec. Startuptime after delete is longer then 5min till login screen.

Is there an issues with deleting snapshots?

My Config:
Host
MAC OSx High Sierra
Virtualbox 5.1.30 (Same Problem was with 5.1.28)
Guest
Windows 10
Storage Format .vdi
Two .vdi files
One for Bootdisk (= C: in Guest) 80GB
One for Datadisk (= D: in Guest) 2GB

Thanks Lukas

[mpack]

Deleting snapshots cannot cause a guest to slow down, so best look elsewhere.

Best guess: deleting snapshots also deleted a bunch of updates, which your Windows guest is now downloading again. Also possible: a bunch of hardware config changes were deleted, now your network is ridden with errors.

A final possibility occurs: the base VDI may be on a slower drive than the snapshots were, but that is niche and should have been easy to spot.

[socratis]

I couldn't agree more with mpack. And since I use extensively the snapshot feature (each of my VMs has at least one), I can tell you that deleting a snapshot does *not* make a guest slower. On the contrary, it should make your guest faster, because VirtualBox doesn't have to read from multiple snapshot files to figure out the "current state" of affairs...