View source for Wikipedia pages are slow to load

= Summary =

Ask Toolbar may cause performance problems with Internet Explorer and SuperMemo.

= Question =

''Sheng Liu wrote:''

Something at the bottom of Wikipedia pages makes elements take terribly long to load (SuperMemo 16). I expect this problem is already known, but I 
thought I'd report it anyway. It's a big time waster and frustrates me with SM as never before. I hope it's fixed soon.

(system data at the bottom of this page)

= More information needed =

* this problem could not be reproduced. Could you provide specific Wikipedia pages that cause this problem?
* imports and page loading have been optimized for speed in SuperMemo 16 and should be much faster than in earlier version (up to 200x acceleration in some bottleneck areas). This optimization was particularly scrupulous for Wikipedia processing. In that light, your problem seems pretty unusual. Please describe in as much detail as possible in what context the slowdown occurs
* is this a Tablet PC? What brand? SuperMemo 16 received very limited testing on Tablets. Possibly there will be an update later in 2014 if there are more tweaks needed for tablets
* do you use Ask Toolbar? Please try to disable it for a while and see how it affects performance. If you did not ask to have Ask Toolbar installed, and you have problems with uninstalling, see [[Error setting HTML text]]
* please try to move SuperMemo away from \Program Files folder, e.g. to c:\supermemo, or d:\supermemo and see if the problem occurs there as well
* if any of the suggestions here help, please do not forget to send back your feedback to formulate an answer for other users if they experience the same problem

= Follow up =

I've chosen a Wikipedia page arbitrarily: 
https://en.wikipedia.org/wiki/Google_Tasks which exemplifies the problem 
as most Wikipedia pages do.

To clarify, the problem is not in importing the Wikipedia pages to SM. I 
most often do so with the following selection:

'''Web page import mode: Local pages (elements hold whole web pages)'''

and this works perhaps slightly faster & smoother than in the previous version of SM.

The problem is during learning. Unless the bottom of the page is deleted or excluded from the given extraction, it takes a long time to work as 
normally e.g. text can't be selected, the page can't be edited, and the "Learn" button will work. This becomes very time-consuming.

= Comments =

* this page at Wikipedia seems to import correctly and fast in Windows 8.1 with Internet Explorer 11 
* no slowdown could be observed when editing or extracting, with or without the bottom part
* the bottom part of the article includes lots of Table and Style material that is notoriously slow when parsed by Internet Explorer. However, this is slow in terms of milliseconds, not in human observable terms
* please try to run Internet Explorer without add-ons. Perhaps you run some extra processes that do some kind of indexing or scanning on the said HTML
* this problem is almost certainly SuperMemo independent. In other words, you need to look for culprits in apps, services and processes around Internet Explorer. Most of all, please disable Ask Toolbar

= System Data =

<pre>

--------------------DETAILS--------------------
SuperMemo 16 Beta G (Build 16.0 Beta G, Nov 18, 2013)
Time: Nov 27, 2013, Wed, 10:10
--------------------COLLECTION STATISTICS
Collection C:\ProgramFiles\SuperMemo\systems\20131018
Date 11/27/2013 (Wed)
First day 8/14/2013
Period 3mth 15 day(s)
Total 15312 el.
Items+Topics 5+15307 el.
Memorized 11614 el. (90.9%)
Memorized items 3 it. (0.0%)
Memorized topics 11611 t. (100%)
Memorized/Day 0.0283 it/day
Outstanding 0+907+1 el.
Subset 0+69+111 (BRAIN)
Protection I=100 T=0.0327
Retention 100.00%
Measured FI 0.00%
Alarm -
Burden 0.444+691.621
Burden +/- (0)+(-48.354)
Workload 2 sec.
Time 0 sec. (1h 58m 56s)
Avg time 5.000 sec.
Total time N/A
Lapses 0.000 (0)
Speed 279 it/ann/min
Cost N/A
Daily cost 1.309 min/it.
Interval (I) 15 day(s)
Interval (T) 1mth 16 day(s)
Repetitions I=1.00 T=1.41
Rep count 0
Last Rep (I) 11/14/2013
Last Rep (T) 10/24/2013
Next Rep (I) 11/29/2013
Next Rep (T) 12/9/2013
Pending 1159 el.
Dismissed 2539 el.
Average FI 7.67% (10%)
Completion 1/11/2126
A-Factor I=3.00 T=1.317
Text Registry 33173 entries
Lexicon 223242 words
FI Cases 0
--------------------WORKLOAD DATA
103. Nov 24, 2013: 0-14
104. Nov 25, 2013: 0-5
105. Nov 26, 2013: 0-16
106. Nov 27, 2013: 0-857
107. Nov 28, 2013: 1-729
108. Nov 29, 2013: 0-737
109. Nov 30, 2013: 2-631
110. Dec 1, 2013: 0-752
111. Dec 2, 2013: 0-637
112. Dec 3, 2013: 0-612
113. Dec 4, 2013: 0-506
114. Dec 5, 2013: 0-416
--------------------ELEMENT DATA
Element: 15841: Orbital part of inferior frontal gyrus
Type: Topic
ComponentPtr: 1334959
MaxCompSize: 77
Reps: 0
Laps: 0
Interval: 0
AFactor: 1.255
UFactor: 0
Postpones: 0
FI: 0
ComPtr: 0
TempPtr: 11
RepHist: 23092
LastRep: 106
Today: 11/27/2013
LastDate: 11/27/2013
--------------------ELEMENT CONTENT
Orbital part of inferior frontal gyrus

 From Wikipedia, the free encyclopedia

MBox([hide]This article has multiple issues. Please help improve it or 
discuss these issues on the talk page.)
MBox(This article may be too technical for most readers to understand. 
Please help improve this article to make it understandable to 
non-experts, without removing the technical details. The talk page may 
contain suggestions. (August 2012))

MBox(This article needs attention from an expert on the subject. Please 
add a reason or a talk parameter to this template to explain the issue 
with the article. Consider associating this request with a WikiProject. 
(August 2012))

MBox(This article needs additional citations for verification. Please 
help improve this article by adding citations to reliable sources. 
Unsourced material may be challenged and removed. (August 2012))

Brain: Orbital part of inferior frontal gyrus
Orbital part of inferior frontal gyrus (shown in red).
Lateral surface of cerebral cortex

Latin
pars orbitalis gyri frontalis inferioris
The Orbital part of inferior frontal gyrus (literally "the part that 
covers") is the part of the inferior frontal gyrus named opercularis 
because it covers part of the insula. The pars opercularis together with 
the pars triangularis form the Broca's area, a neuroanatomic region 
important in speech-language production.
In the human, this region occupies the triangular part of the inferior 
frontal gyrus and, surrounding the anterior horizontal limb of the 
lateral sulcus, a portion of the orbital part of the inferior frontal 
gyrus. Bounded caudally by the anterior ascending limb of the lateral 
sulcus, it borders on the insula in the depth of the lateral sulcus. 
Cytoarchitectonically it is bounded caudally by the opercular area 44, 
rostrodorsally by the area 46 of Brodmann ( human ) and ventrally by the 
area 47 of Brodmann ( human ) ( Brodmann-1909 ).[1]
Syudo Yamasaki et al. (1 September 2010) found that a ...
--------------------SYSTEM DATA
Windows 8 ver. 6.2 (Build 9200)
Internet Explorer MSHTML Engine ver. 7.0 (0)
IE Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.2; WOW64;
Trident/6.0; .NET4.0E; .NET4.0C; .NET CLR 3.5.30729; .NET CLR 2.0.50727; 
.NET CLR 3.0.30729; Tablet PC 2.0; InfoPath.2; AskTbORJ/5.15.23.36191; 
MDDSJS)
User language: English (en-AU)
System language: English (en-GB)
Browser language: English (en-GB)
Computer: HOMEPC
Disk Free C: (Collections): 140.71 GB
Total physical memory: 4.16 GB
Free physical memory: 1.6 GB
Page file: 7.46 GB
Free page file: 4.24 GB
Virtual memory: 2.15 GB
Free virtual memory: 1.67 GB
Extended virtual memory: 0 bytes
SuperMemo heap memory: 7.43 MB
Free heap memory: 3.62 MB
Heap memory use: 51.29%
Active Code Page: 1252
OEM Code Page: 850
Host: HomePC
IP Address: 192.168.0.16
Server: HomePC
Host HD: FAD5-746C
SuperMemo owner: User of SuperMemo
Collection author: User of SuperMemo
Network installed

</pre>