Excel vba slow down execution. Learn proven optimization techniques of VBA code.
Excel vba slow down execution Sep 11, 2025 · Discover the 5 biggest VBA performance killers that slow down your Excel code. Everything works perfectly for me and some of my co-workers (r Jul 19, 2012 · I have written a little sub to filter approx. These settings should be disabled in all large procedures. Feb 6, 2022 · The slow down occurred in a single day and in every one of the 23 macros. Thanks to the entire community for helping me learn every day. May 16, 2005 · The below macro, which I have left literally as coded, runs very quickly from Excel -- until, in Excel, I do either a print or print preview in native Excel, not VBA. Aug 24, 2020 · I'm working on a procedure that copies data from one workbook to another, skipping rows that don't contain certain values in column F. I installed Win 11 thinking it was a Windows problem. Jun 3, 2025 · The slow VBA Macro process time significantly narrows or pushes the trade window to ~ 12:30 noon to 4:00 pm EST considering that trade decisions are made with the daily processed data. If I press Ctrl+Break the macro stops after a few minutes, the debugger shows the current line highlighted as usual, but Excel keeps using 25% CPU (that is 100% of two cores). I have used some optimizing techniques in the main module. Insert Shift:=xlToRight, CopyOrigin:=xlFormatFromLeftOrAbove 'Add Header Range ("N1"). I used this macro before the latest update with lists up to 50 files, each being of order of 10 MB. Years long execution experience at a consistent performance level validates the code. Jan 11, 2023 · By default, Excel updates the screen after each change, which can slow down your code. Apr 1, 2025 · Excessive Screen Updating: VBA updates the screen each time it executes a line of code that affects the worksheet, which can slow down the execution of macros. To prevent this, you can disable screen updating at the beginning of your macro with `Application. There are two things that dramatically slow things down 1. At this point every click on Excel or on the VBA IDE is responsive, but very slow. Method 1 - Simple but Not Versatile Add this line of code anywhere in your macro where you want it to pause. I'm familiar with application. One is to use DoEvents procedure at the end of each loop. Select ActiveCell. 000 items in an Excel List. All to Jan 20, 2023 · VBA newbie here. I can't seem to pinpoint why. After more tests it is now obvious Excel is not happy with the original formatting in the merged cells. If slow VBA scripts have ever held you back, this training will transform the way you work with Excel and help you build high-performance applications with ease! Apr 1, 2025 · Excessive Screen Updating: VBA updates the screen each time it executes a line of code that affects the worksheet, which can slow down the execution of macros. Mar 15, 2024 · The easiest way to improve the speed of your VBA code is by disabling ScreenUpdating and disabling Automatic Calculations. DoEvents yields execution so that the operating system can process other events. This allows you to slow down the execution of a macro. ScreenUpdating = False` and re-enable it at the end with `Application. The code works 100% like I would expect it to, other than the fact that it starts to slow down after 10-15 minutes. Jun 27, 2014 · Slow Copy and Paste I've looked at dozens of solutions to slow VBA/macro copying and pasting, but most of the problems are way beyond what I'm doing, and I just can't get this basic function to work without exponentially slowing down. These pitfalls can range from inefficient coding practices to a lack of understanding of how VBA interacts with Excel objects. Calculation If you have a large spreadsheet with complex formulas or formulas linked to separate workbooks, this can really slow down a macro. Another way is to turn off Excel Calculation, put Application. Merge Across:=True. How to make a macro stop or pause for a specified amount of time. ScreenUpdating May 21, 2008 · Why is my excel VBA code execution randomly slowing down? May 21, 2008 12:07 PM Subscribe Sometimes excel VBA code executes very slow. When the "cursor" caused the screen to scroll down, there was a grey area where the rest of the worksheet would normally be, you know what non-responsive windows look like. refreshing the screen after each cell interaction, and 2. Apart from Doevents and other time delay techniques, which are basically a workaround, is there a way through which we can get around the asynchronous execution. To improve performance, you can turn off screen updating while your code runs. After which, the macro, when next invoked, runs about 10 times slower which makes it performance unacceptable. Sep 8, 2017 · -1 It's weird that I'm finding ways to slow down my macro. 000 Iterations. Mar 17, 2022 · I've noticed that when many files are being opened and closed within a loop it can cause things to slow down over time. ScreenUpdating Jul 19, 2012 · I have written a little sub to filter approx. A few things can mitigate. Calculation = xlCalculationAutomatic at the bottom to enable it again. FormulaR1C1 = "TL Oct 18, 2002 · is it possible to run a code in slow motion? I have a macro that reareanges the worksheet but I would like the macro to slow down. Apr 2, 2025 · When optimizing VBA loops for performance, it's crucial to recognize the common pitfalls that can inadvertently slow down your code. So, my question is, what can be happening that slows down Excel to a crawl, sometimes for a minute or two, sometimes for hours, and its workload is spread across calls to DoEvents. Jul 20, 2017 · Excel became non-responsive after a few seconds but I could still see what it was doing on the screen. Feb 5, 2022 · Hi I have a vba macro that opens an excel file, reads some data, does some calculations and closes that file and then opens another file from the list. recalculating the worksheet after each cell interaction. Select Columns ("N:N"). I have a "Main" sheet from which I can push any of several buttons to run a macro (that I simply recorded). Calculation = xlCalculationManual at the top of your sub to disable recalculation and Application. Accessing Excel every time you want to get a value isn't very efficient compared to looping through an array. It works as expected, but it gets really slower and slower after like 30. Mar 20, 2018 · As part of our work to help enterprises upgrade to Office 365 ProPlus, we have found that some users have been experiencing slow running VBA, which can be frustrating. Jul 23, 2010 · Dear Friends, I am using the below vba code which works absolutely fine but the only problem is it slows down after every run when I open excel and run it for the first time it takes 100 milliseconds and then second time it takes 150 milliseconds and then third time it gets more slow the Jan 4, 2010 · If I copy any cell on any worksheet and then paste it as a picture link anywhere in workbook, execution of VBA slows. Effective use of these functions can be obtained faster than the use of VBA code. conditional formatting may slow down things a lot; use for each loop on a range if possible instead of while, or even copy range to variant array and iterate over that (that is the fastest solution); Want to get your Excel macros back to peak performance? Keep reading for detailed insights, practical fixes, and useful tips to speed up VBA routines in Microsoft 365 Excel. Jun 21, 2021 · From what I tested before, and just a moment again using a breakpoint, the exact part where the code execution slows down is . Calculation in Excel refers to Excel recalculating all formulas and functions in a worksheet after each time that something is changed in that worksheet. Sometimes it's really fast. screenupdating = false and turning off autocalculation. 56. Thereby throwing control back to the calling May 25, 2017 · Hello All, Long time reader, first time poster. Mar 17, 2022 · This is part of something I'm going to do later where I actually populate each of the files with the data from the text file - but first I want to just create all the Excel files - thousands of them. Your code does not seem to be doing any calculating, but you are interacting with the screen. I have 2 line breaks in each cells and it is what is slowing down the execution when merging again. Apr 11, 2025 · Understanding the root causes of these performance bottlenecks is crucial for optimizing your vba applications and ensuring a smooth user experience. If there is a way to revert to the previous automatic or default Optimization on workbook opening even it means slow workbook opening and saving. … Jun 8, 2017 · This is part of a bigger main module that runs a program as a whole but this is the part that causes the slow down. This site has some good pointers on optimization of VBA code for excel. txt file. Mar 19, 2020 · 0 When you interact with the Excel Object Model it can be very slow. Even for private subs on unrelated worksheets. Feb 2, 2020 · Does the usage of named cells in VBA code slow down the macro? I assume that if you use one or two named cells/ranges in your VBA code it does not affect its execution time a lot. The good news is that there are steps which can be taken to improve performance. I have a workbook that queries an access database and then copy / paste / transposes each row to a column on a region specific tab to re-create a sheet that is used by the entire Oct 10, 2022 · Excel also includes other mathematical statistical functions such as PRODUCT, COUNTIF, etc. The Insanity Returns This November — But Only 80 Get More!. As in, I want the VBA code to behave like this: Optimize VBA code with these 25 top performance improvement tips to get maximum VBA speed up after compilation with VbaCompiler for Excel. Something changed in my Excel. First it appears that my macro runs like a champ on the first time, however if I try to run it again, it runs very slow. , as well as some lookup functions such as VLOOKUP. then I added some code that actually saved and closed my real macro. I used The Microsoft Office Repair Tool, Online option to make sure Excel was not corrupted. It usually takes minutes before you see the cursor moving to the clicked spot. It was lightning quick before I left yesterday, now it takes 2-3 seconds at a time to assign a value to a cell. Jul 3, 2017 · Now Excel slows way down whenever a macro is assigning values to cells or clearing them. Jun 4, 2008 · Do I put this in the private sub I want to slow down? Private Sub Macro10 () 'Add column for difference between truckload weight and original price Sheets ("Expiration Report"). I have a VBA macro which is designed to create a data table on a named range, paste the data table as values and then export the data table to a . So what I did was created a small macro that opens my original macro and it runs beautifully. As for clearing the empties afterwards, the way I've done this before is created a Collection that tracks, while you're looping through the array, the array rows that are empty. Learn proven optimization techniques of VBA code. Select Selection. Jan 20, 2022 · VBA - very slow macro execution on (theoretically) newer, better computer Asked 3 years, 8 months ago Modified 3 years, 8 months ago Viewed 1k times You’ll learn how to time your code execution, optimize calculations, use xlsb file formats for faster processing, and leverage screen updating & application events to improve speed. Sep 22, 2021 · Hershner04 I found a clumsy work around the slow macro problem. yg04 tf8rp fi06 hkt6w snj 4qvj pxm osead rc 7z1ps