Question regarding slow page loading with attr set

Hi, I am trying to find out why a page save takes a lot longer when there is a page attribute set, compared to where a global password is used.
For testing I got identical pages. One has an edit password set as page attribute (?action=attr), the other is just protected via a global edit password in config.php.
Setting in config.php 
$EnableDiag = 1; 
$EnableStopWatch = 1;
I get these two stopwatch logs for identical actions, using a fox form processing to save to the page:
(Just noticing: actually even the display of these pages, without any saving, takes 5.4secs for the page with attribute, but only 0.05 secs for the one without!)

On the page without page edit attribute (just the global edit password): 0.09 secs
===============================
0: 0.00 FoxHandlePost: begin
 1: 00.00 FoxProcessTargets: begin $tn
 2: 0.00 FoxProcessTargets: Test.Post4
 3: 00.00 UpdatePage: begin Test.Post4
 4: 00.00 UpdatePage: ReplaceOnSave (Test.Post4)
 5: 00.00 UpdatePage: SaveAttributes (Test.Post4)
 6: 00.00 MarkupToHTML begin
 7: 00.01 MarkupToHTML end
 8: 00.01 UpdatePage: MergeLastMinorEdit (Test.Post4)
 9: 00.01 UpdatePage: SaveChangeSummary (Test.Post4)
10: 00.01 UpdatePage: PostPage (Test.Post4)
11: 00.01 PHPDiff: begin
12: 00.01 PHPDiff: end
13: 00.01 UpdatePage: PostRecentChanges (Test.Post4)
14: 00.02 UpdatePage: FoxPostNotify (Test.Post4)
15: 00.02 UpdatePage: PostPageIndex (Test.Post4)
16: 00.02 PageIndexQueueUpdate: queued 1 pages (1 total)
17: 00.02 UpdatePage: end Test.Post4
18: 0.02 FoxHandlePost: end
19: 00.02 FoxFinish start
20: 00.03 MarkupToHTML begin
21: 00.04 MarkupToHTML end
22: 00.04 MarkupToHTML begin
23: 00.04 MarkupToHTML end
24: 00.04 MarkupToHTML begin
25: 00.04 MarkupToHTML end
26: 00.04 MarkupToHTML begin
27: 00.04 MarkupToHTML end
28: 00.04 MarkupToHTML begin
29: 00.05 MarkupToHTML end
30: 00.05 MarkupToHTML begin
31: 00.06 MarkupToHTML end
32: 00.06 MarkupToHTML begin
33: 00.07 MarkupToHTML end
34: 00.07 MarkupToHTML begin
35: 00.09 MarkupToHTML end
36: 00.09 now

On the page with page edit attribute 5.7 secs:
=====================================
0: 0.00 FoxHandlePost: begin
 1: 00.00 FoxProcessTargets: begin $tn
 2: 0.22 FoxProcessTargets: Test.Post5
 3: 00.22 UpdatePage: begin Test.Post5
 4: 00.22 UpdatePage: ReplaceOnSave (Test.Post5)
 5: 00.22 UpdatePage: SaveAttributes (Test.Post5)
 6: 00.22 MarkupToHTML begin
 7: 01.50 MarkupToHTML end
 8: 01.50 UpdatePage: MergeLastMinorEdit (Test.Post5)
 9: 01.50 UpdatePage: SaveChangeSummary (Test.Post5)
10: 01.50 UpdatePage: PostPage (Test.Post5)
11: 01.50 PHPDiff: begin
12: 01.50 PHPDiff: end
13: 01.50 UpdatePage: PostRecentChanges (Test.Post5)
14: 01.51 UpdatePage: FoxPostNotify (Test.Post5)
15: 01.51 UpdatePage: PostPageIndex (Test.Post5)
16: 01.51 PageIndexQueueUpdate: queued 1 pages (1 total)
17: 01.51 UpdatePage: end Test.Post5
18: 1.51 FoxHandlePost: end
19: 01.51 FoxFinish start
20: 01.88 MarkupToHTML begin
21: 04.15 MarkupToHTML end
22: 04.16 MarkupToHTML begin
23: 04.16 MarkupToHTML end
24: 04.16 MarkupToHTML begin
25: 04.58 MarkupToHTML end
26: 04.58 MarkupToHTML begin
27: 04.59 MarkupToHTML end
28: 04.59 MarkupToHTML begin
29: 04.80 MarkupToHTML end
30: 04.80 MarkupToHTML begin
31: 05.27 MarkupToHTML end
32: 05.27 MarkupToHTML begin
33: 05.49 MarkupToHTML end
34: 05.49 MarkupToHTML begin
35: 05.70 MarkupToHTML end
36: 05.70 now

Something different after the page is saved seems happening in the second case. Not sure , or what to look for, just noticing a real slowdown if I have a page attribute (page password) set.
Thanks for any hints!


-- 
Best regards,
Hans Bracker