Why is NTLite suddenly so slow with latest ISOs?

S

Sonicmojo

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Been working on a new 25H2 build using this specific ISO (via MSDN/MVS)

en-us_windows_11_business_editions_version_25h2_updated_jan_2026_x64_dvd_09c1e011

I am using my standard rock solid set of config changes that I have used for over two years now. Up until this specific ISO - NT Lite would plow through my config from start to finishing install ISO in just over 4 minutes and change (WITH Defender Real Time Scanning disabled).

Now - on this ISO - the time is up over 10 minutes without fail. I even walked thru a complete clean "rebuild" today - painstakingly recreating my usual mix - setting by setting - section by section - and it still ended up like this:

1770569432059.png

9:33.

Has there been a massive change in how NT Lite works it's changes? The biggest delays were in Optimizing (export WIM). Before this would take less than a minute on average - now I am seeing 3-4 minutes of activity on this step.

Appreciate any other reports from the field.

S
 
And then just to add insult to injury....I now get this too:

1770570468051.png

There is something major wrong with this actual MS ISO.

This is about the 5th time I have seen this now. Not exactly sure what this ISO does not like - as noted in my first post - my NT Lite settings (that have been rock solid for 3+ years now - across both Win 10 and 11) are now suddenly not good - with this ISO specifically.

I will try an older 25H2 ISO from Nov 2025 and see what happens.

S
 
If you're integrating Windows updates, that's what takes the most time
 
tistou77 said:
Okay, for me that's what takes up the most time.
Click to expand...

Understood - that is why I do not add any updates.

But my usual build time (with Defender disabled) is about 4 mins and a bit - even with my last really excellent ISO done in Oct 2025 (25H2) - NT Lite rolled through that in 4 mins and 7 seconds.

Now - regardless of what I try to do - every build is over 10-12 minutes - even with an identical (and hand rebuilt) template as the one I ran last fall.

S
 
Integrating the updates takes approximately 8 minutes, out of the entire NTLite process (14m 28s), for me

Capture.PNG

With Windows ISOs getting "larger" with the latest updates, the process of recreating the image, for example, takes a little longer, but nothing too drastic.
Between 26100.xxx and 26200.7705, it might take a minute longer, for me
 
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