For Next Loop Getting Slower And Slower

Mar 11, 2013

I wrote the following:

for i = 1 to 10000
if cells(1,1).value=" " then
row(i ":" & i).select
selection.entirerow.delete
end if
next i

At first it runs very fast but getting slower and slower. What could be the cause and how to fix it?

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Loop Referencing Sheet Gets Progressively Slower

Nov 28, 2011

I have a simple function that pulls in a single cell value, one per row, stores it in a property of a custom type, and then does a little more processing based on the value.

The custom type is GR, the property is CGID.

Code:
With Worksheets("Sheet1")
GR.CGID = UCase$(Trim$(.Range("CGID")(rw).Text))
End With

It runs fine with no noticeable performance changes up to around 10,000 records, but beyond that, it gets progressively slower and slower and slower until, at about the 20,000 record mark, it's processing at about 1/10 the speed it started at! (100 recs/sec instead of 1000+)

For testing purposes, all the cell values are the same, and are a small string value.

I know that hitting the sheet from VBA is time-intensive itself, so of course it makes sense that if I had two calls to the sheet, it would take twice as long to run the function as if I have just one. But this issue where the processing speed decreases as time goes on leads me to think there's some kind of garbage collection or memory allocation problem that I hope can be solved.

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I am parsing 15,000 files from a network server. The files are all the same format and length. The problem is that the first few iterations of my loop run fairly quickly, 7 to 9 seconds a case, but after only 300 iterations I'm up to 60 seconds a case. How do I keep the last iteration running as fast as the first iteration? I've included the main loop of my parsing routine below.

Sub Fill_Summary_Tabs() 'fills out the Datapack and JMP tabs
Application. ScreenUpdating = False 'turn off screen updating for speed

Call PrepImporterTab 'formats the Importer Tab so that everything runs smoothly < 1 second
Dim fs
Set fs = CreateObject("Scripting.FileSystemObject") 'part of the filename test

For N = StartingCase To EndingCase '***** Start of the Parsing Loop *****

Sheets("Setup"). Cells(20 + N, 1).Value = Time 'Print the start time of each case....................

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When I run macros usually they're fast, but occasionally will run very slow. An example macro I have is pasted below. It's just a simple macro that pastes months. If I am pasting on top of a cell that contains a month it pastes the rest of the months that follow.

Most of the time this macro runs very fast, but occasionally it takes about 1-2 seconds to run, and it is a very simple macro! It is not macro specific, as all my macros will be slow. I''m using Windows 7 with Excel 2010. I'm only using 23% of my CPU and 4.5GB of my 16GB of RAM, so I don't think it's a hardware thing.

Is there some kind of condition that occurs that will make excel run macros slower?

[Code] .....

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I wrote a custom find function to search for a list of numbers across a bunch of worksheets (6 in total). A cell reference is sent to the function and it basically returns the worksheet name and address for the first occurence, or nothing if not found.

Now I realise that the number of cells that need to be checked is fairly severe across 6 worksheets (finding 65 numbers * 65536 * 256), but this still takes about 1 minute to execute... is that about right? Code was hacked together quickly and is nothing special...

Public Function My_Find(Optional my_range As Range) As String

Dim ws As Worksheet
Dim my_cell As Variant
Dim result As Variant

Application. ScreenUpdating = False
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With Sheets("regrade pharm_standalone")
For Each r In .Range("standaloneTerritory")
If r.Value = "X101" Then
r.EntireRow.Copy
Sheets("X101").Range("A1").End(xlDown).Offset(1).PasteSpecial xlPasteValues
End If
Next r
End With
-------------------
I need to repeat this loop for values from X101 to X151. In all cases, the sheet name is equal to the value I'm looking up (eg: value = X102 goes to sheet X102).

I have a named range called 'territories' that contains the list of X101 -> X152.

I'm hoping to make the code perform the loop for each of the territories without my having to copy & paste and change the 'X101' 51 times as this would seem a rather silly thing to do!

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Macro which loops through a number of files and calls the same macro in each of them. Unfortunately when I add "Application.Run..." to the code, it no longer loops through the process and instead stops after updating the first file in the loop. If I remove the "Application.Run..." code and add any other code, the loop works fine and it continues through the process repeating all the steps for each file found.

Why it stops after one file when using "Application.Run..." to call the macros?

NB I have a list of path and file names starting in row 8 of columns A and C. Each file in the list has a macro called UpdateS1 and promoupdate1.

Sub C_Run_Loop_Macro()
Dim lastRow As Long
Dim i As Long

[Code]....

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I have working code that returns a row number within a for loop based on parameters I set.

Each time the for loop runs I would like to store this row number, then after the loop has finished, delete all stored rows.

Code:
for rowNum = 1 to x (some variable end row number which I already have worked out using End(xlUp).Row)
if x = y then
*storedRow = rowNum
end if
next rowNum
*

Lines with a * are the bits I can't work out. I've been trying to understand arrays by reading posts on what other people have done, but I can't fit (or fully understand) the reDims, or reDim preserves into my code. I've seen what appear to be quite complex ways involving uBounds and LBounds, but unfortunately I can't see how to use them.

All I want is to simply keep adding a row numbers to a variable, (i.e. row 2, 5, 20, 33, 120, etc) and then delete those specific rows.

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I am looping through each cell in a range and I would like to loop in reverse order.

Dim CELL As range
Dim TotalRows As Long
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For Each CELL In Range("C1", "C" & TotalRows)
CELL.Select
'Code here to delete a row based on criteria
Next

I have tried:

For Each CELL In Range("C" & TotalRows, "C1")

and it does not make a difference. I need to loop in reverse order since what I am doing in the loop is deleting a row. I am looking at a cell and determining its value. If the value is so much, then the row gets deleted. The problem is that the next row "moves up" one row (taking the pervious cell's address) and therefore the For Each Next loop thinks it has already looked at that row.

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I have a workbook that contains, say, 50 worksheets: the first two worksheets summarise the data and are static in that they don't move position. However, the next four worksheets contain certain data for any given month. Each time a new month comes along, say, November, I insert four new worksheets after the two static ones as a result October's four worksheets are simply moved down the line in terms of worksheet order.

I need a macro to refer to the first six worksheets only (not the other tabs). I opted for index referencing for each worksheet, ie one - six. Now within these six worksheets in any given month, I need to sort the data by a certain column. The problem: in sheets 1,4,5 and 6 I need to rank by column E, but in sheets 2 and 3 I need to rank by column C. I have stepped through the code, which works for sheets 3-6, but doesn't seem to refer to sheets 1-2.

Sub WorksheetLoop()
'
' Loop through an indexed number of worksheets; _
' & this ensures that the worksheet range is dynamic _
' and is able to adjust when new sheets are added/removed, etc.
'
'Dim ws As Worksheet
Dim i As Long
Dim ws As Worksheet

[code]....

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Here's the code I have settled for esp between the commented lines of hash symbols, which does change the counter (see the commented exclamation marks), but prevents an infinite loop (on my second try!) by using a second boolean flag of "HasCounterBeenChanged". Is there a better way of doing this? Or, alternatively (not in my thread title), is it possible to prevent the active file being selected through one of the arguments in the getopenfilename method?

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For example. This is the first worksheet. So far, my macro loops through the column with rows 1-5. It looks in the offset cell(0,2) for Isempty value and then places that value into the offset cell(0,6)

text
1
text
text

[Code]....

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Sub Filterout()
Dim c As Range
Dim rng As Range
Dim i As Long
Dim lrow As Long
Dim counter As Integer
lrow = Cells(Rows.Count, 3).End(xlUp).Row
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am i doing something wrong?

dan
==========================================================
Thanks to Aaron Blood for the find_range function. i also poached the lastrow function from somewhere on ozgrid, but I cant remember the name of the poster.
==========================================================

Sub new2()

Dim Org_Area As Variant
Dim Item As Variant
Dim Copy_To1 As Variant
Dim Cell_Ref As Variant

r = 1 ..................

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Dim CurCell As Object
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Image
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Dim i As Long
Dim FaultCode As String
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Dim SecondGoRow As Long
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This code is supposed to look at each cell in column A, and if it is not blank, it is supposed to highlight the entire row yellow and move down one row. If the cell is blank, I want it to just move down to the next row. The loop is supposed to run until it hits the "x" at the end of the range of cells.

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