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<title>Optimization Results</title>
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<div id="control">
<span class="productTitle">ExpTreeLib Demo</span><br />
<span class="topicTitle">Optimization Results</span><br />
<p>
<a href="../Exp_Index.htm">ExpLib and Demo Package</a><--
<a href="ImprovingResponsiveness.htm">Improving Responsiveness</a><--
<a href="Responsiveness.htm">Responsiveness Analysis</a><--
Optimization Results
--><a href="OtherOptimizations.htm">Other Optimizations</a>
</p>
</div>
<div id="main">
<h3><a id = "BkMrk_1">Summary</a></h3>
<p>The original version of the Demo Forms as implemented in frmDragDrop provides a
perfectly acceptable user experience when working with Local Folders of a
reasonable size. When working with large and/or Remote Folders, the GUI may
"freeze" for an unacceptable period of time, particulary on first display of a
Folder.</p>
<p>After considerable research and investigation I have implemented some
optimization of that code. That optimization is implemented in
<a href="frmTemplate.htm">frmTemplate</a>.</p>
<p>In certain cases - primarily very Large Remote Folders - the optimized code still
provides an unacceptably slow GUI, "freezing" for long periods of time. To
overcome this problem, I implemented <a href="frmThread1.htm">frmThread</a>
which performs much of its' work in a BackgroundWorker Thread.</p>
<p>The results below are from determining the time for key phases of displaying the
Contents of a Folder in the ListView. The tests are discussed
<a href="Responsiveness.htm">here</a>. All time values are in milliseconds of
elapsed time. All tests were run a number of times with the average times
displayed here.</p>
<h3><a id = "BkMrk_2">Original Demo Form (derived from frmDragDrop)</a></h3>
<p>The Form becomes responsive ("unfreezes") after <b>Total</b> time.</p>
<table border="0" cellpadding="0" cellspacing="0" style="border-collapse:collapse;width:331pt;margin-left:6em" width="441">
<colgroup>
<col style="width:83pt"
width="111" />
<col span="4" style="width:48pt" width="64" />
<col style="width:56pt"
width="74" />
</colgroup>
<tr style="height:15.0pt">
<td class="style1" height="20" width="111">
</td>
<td class="style2" width="64">
Avg ms</td>
<td class="style2" width="64">
Avg ms</td>
<td class="style2" width="64">
Avg ms</td>
<td class="style2" width="64">
Avg ms</td>
<td class="style3" width="74">
Avg ms</td>
</tr>
<tr style="height:15.0pt">
<td class="style4" height="20">
Folder Location</td>
<td class="style5">
GetItems</td>
<td class="style5">
Sort</td>
<td class="style5">
GenTime</td>
<td class="style5">
IconTime</td>
<td class="style5">
Total</td>
</tr>
<tr style="height:15.0pt">
<td height="20" style="height:15.0pt">
Win7 Desktop</td>
<td align="right" class="style6">
57.2</td>
<td align="right" class="style6">
52.0</td>
<td align="right" class="style6">
416.0</td>
<td align="right" class="style6">
296.4</td>
<td align="right" class="style6">
826.8</td>
</tr>
<tr style="height:15.0pt">
<td height="20" style="height:15.0pt">
Vista Laptop</td>
<td align="right" class="style6">
317.2</td>
<td align="right" class="style6">
93.6</td>
<td align="right" class="style6">
8,387.6</td>
<td align="right" class="style6">
1,617.2</td>
<td align="right" class="style6">
10,431.2</td>
</tr>
<tr style="height:15.0pt">
<td height="20" style="height:15.0pt">
XP Desktop</td>
<td align="right" class="style6">
946.4</td>
<td align="right" class="style6">
88.4</td>
<td align="right" class="style6">
29,130.5</td>
<td align="right" class="style6">
3,598.4</td>
<td align="right" class="style6">
33,779.3</td>
</tr>
<tr style="height:15.0pt">
<td height="20" style="height:15.0pt">
WHS</td>
<td align="right" class="style6">
613.6</td>
<td align="right" class="style6">
98.8</td>
<td align="right" class="style6">
61,084.5</td>
<td align="right" class="style6">
6,110.0</td>
<td align="right" class="style6">
67,906.9</td>
</tr>
</table><br />
<h3><a id = "BkMrk_3">frmTemplate - optimized but with no Background processing</a></h3>
<p>The Form becomes responsive ("unfreezes") after <b>Total</b> time.</p>
<table border="0" cellpadding="0" cellspacing="0" style="border-collapse:collapse;width:488pt;margin-left:6em" width="650">
<colgroup>
<col width="111" />
<col span="2" width="64" />
<col width="74" />
<col width="71" />
<col width="74" />
<col width="74" />
</colgroup>
<tr>
<td height="20" width="111">
</td>
<td class="style2" width="64">
Avg ms</td>
<td class="style2" width="64">
Avg ms</td>
<td class="style2" width="74">
Avg ms</td>
<td class="style2" width="71">
Avg ms</td>
<td class="style2" width="74">
Avg ms</td>
<td class="style2" width="74">
%Total/</td>
</tr>
<tr>
<td height="20" class="style7">
Folder Location</td>
<td class="style2">
GetItems</td>
<td class="style2">
Sort</td>
<td class="style2">
GenTime</td>
<td class="style2">
IconTime</td>
<td class="style2">
Total</td>
<td class="style2">
Original</td>
</tr>
<tr>
<td height="20">
Win7 Desktop</td>
<td align="right">
50.7</td>
<td align="right">
50.7</td>
<td align="right">
503.1</td>
<td align="right">
54.6</td>
<td align="right">
674.7</td>
<td align="right">
81.6%</td>
</tr>
<tr>
<td height="20">
Vista Laptop</td>
<td align="right">
202.8</td>
<td align="right">
93.6</td>
<td align="right">
8,927.1</td>
<td align="right">
46.8</td>
<td align="right">
9,274.2</td>
<td align="right">
88.9%</td>
</tr>
<tr>
<td height="20">
XP Desktop</td>
<td align="right">
865.8</td>
<td align="right">
93.6</td>
<td align="right">
16,606.2</td>
<td align="right">
50.7</td>
<td align="right">
17,624.1</td>
<td align="right">
52.2%</td>
</tr>
<tr>
<td height="20">
WHS</td>
<td align="right">
631.8</td>
<td align="right">
101.4</td>
<td align="right">
40,903.3</td>
<td align="right">
46.8</td>
<td align="right">
41,691.1</td>
<td align="right">
61.4%</td>
</tr>
</table><br />
<h3><a id = "BkMrk_4">frmThread - optimized and with all but First 32 items filled by BackgroundWorker using FFF/FNF Api</a></h3>
<p>The Form becomes responsive ("unfreezes") after <b>GUI Active</b> time.</p>
<table border="0" cellpadding="0" cellspacing="0" style="border-collapse:collapse;width:589pt;margin-left:6em" width="784">
<colgroup>
<col width="111" />
<col span="3" width="64" />
<col width="74" />
<col width="71" />
<col width="74" />
<col width="64" />
<col width="70" />
<col width="64" />
</colgroup>
<tr>
<td height="20" width="111">
</td>
<td class="style2" width="64">
Avg ms</td>
<td class="style2" width="64">
Avg ms</td>
<td class="style2" width="64">
Avg ms</td>
<td class="style2" width="74">
Avg ms</td>
<td class="style2" width="71">
Avg ms</td>
<td class="style2" width="74">
Avg ms</td>
<td class="style2" width="64">
Avg ms</td>
<td class="style2" width="70">
%GUI/</td>
<td class="style2" width="64">
%Total/</td>
</tr>
<tr>
<td height="20">
System</td>
<td class="style2">
GetItems</td>
<td class="style2">
Sort</td>
<td class="style2">
First32</td>
<td class="style2">
SparseLoad</td>
<td class="style2">
GUI Active</td>
<td class="style2">
InfoTime</td>
<td class="style2">
All Filled</td>
<td class="style2">
Original</td>
<td class="style2">
Original</td>
</tr>
<tr>
<td height="20">
Win7 Desktop</td>
<td align="right" >
120.9</td>
<td align="right" >
50.7</td>
<td align="right" >
11.7</td>
<td align="right" >
132.6</td>
<td align="right" >
323.7</td>
<td align="right" >
335.4</td>
<td align="right" >
1,205.1</td>
<td align="right">
39.2%</td>
<td align="right">
145.8%</td>
</tr>
<tr>
<td height="20">
Vista Laptop</td>
<td align="right" >
187.2</td>
<td align="right" >
105.3</td>
<td align="right" >
159.9</td>
<td align="right" >
136.5</td>
<td align="right" >
592.8</td>
<td align="right" >
760.5</td>
<td align="right" >
2,351.7</td>
<td align="right">
5.7%</td>
<td align="right">
22.5%</td>
</tr>
<tr>
<td height="20">
XP Desktop</td>
<td align="right" >
822.9</td>
<td align="right" >
93.6</td>
<td align="right" >
343.2</td>
<td align="right" >
132.6</td>
<td align="right" >
1,400.1</td>
<td align="right" >
4,410.9</td>
<td align="right" >
6,996.6</td>
<td align="right">
4.1%</td>
<td align="right">
20.7%</td>
</tr>
<tr>
<td height="20">
WHS</td>
<td align="right" >
627.9</td>
<td align="right" >
101.4</td>
<td align="right" >
518.7</td>
<td align="right" >
136.5</td>
<td align="right" >
1,388.4</td>
<td align="right" >
1,497.6</td>
<td align="right" >
6,509.1</td>
<td align="right">
2.0%</td>
<td align="right">
9.6%</td>
</tr>
</table><br />
<h3><a id = "BkMrk_5">Analysis of Results</a></h3>
<p>Note that these results are for an abnormally large Folder. It is worth noting
here that frmTemplate which does no background processing will "unfreeze" in
less than 2 seconds when displaying a Folder of 120 items on the slowest system
(WHS). On the test (3,000 item) Folder on the same system, it takes 41.6 seconds
to "unfreeze". Your milage may vary.</p>
<p>In all cases, the optimizations reduced the time during which the GUI "freezes".
The amount of reduction varies among PCs and OSes, but is always an improvement.
However, in all but the Local case, the amount of "freeze" time is too long for
an acceptable user experience, when working with the test Folder.</p>
<p>frmThread combines the optimizations found in frmTemplate with the use of the
FFF/FNF API in a BackgroundWorker Thread to "unfreeze" the GUI in under 2
Seconds for all systems. Note that in the Local case the difference in time to
"unfreeze" is less, but not noticibly so to the user. Note also that in the
Local case, the time to gather all the infomation is actually longer than in
either of the other two approaches. I attribute this to the overhead of
communicating between threads. </p>
<p> </p>
<p><b>See Also:</b></p>
<p style="margin-left:2em"><a href="OtherOptimizations.htm">Other Optimizations</a></p>
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After 30+ years working in the IT field, mostly managing SysAdmins, I have retired. One of my hobbies returns me to programming, basically just to keep my hand in.
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