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General performance issues in Business Central

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Posted on by MU-19110921-0

Hello

I am experiencing general performance issues at one of our customers and it is hard to pinpoint the cause.

In general, the UI seems really slow compared to my other customers. When creating a sales line, the UI gets stuck when trying to select an item no. from the dropdown. When the item is finally selected a box appears "Working on it" - "Calculating invoice discount".

The performance profiler seems to show nothing alarming:

The Azure Region on the production environment is "Europe" so I asked the customer to do a Azure Latency Test - nothing odd here:

When I access the customer's environment with my GDAP access I do not experience the same issues. Everything seems quite "normal".

Can anyone please give ideas on how to proceed from here?

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Dynamics 365 Business Central

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OussamaSabbouh 12,803 Super User 2026 Season 1 on at

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Hello,

Since the system is fast for you but slow for the customer, the root cause is almost certainly on the user side — browser, device, personalization, or local security software — not the BC environment or Azure latency.

Ask them to try:

different browser / incognito

another PC

removing FactBoxes & heavy personalization

checking VPN, antivirus, extensions, etc.

These are the most common reasons why only specific users experience delays like “Working on it – Calculating invoice discount.”

Regards,

Oussama Sabbouh

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YUN ZHU 99,055 Super User 2026 Season 1 on at

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Have you gone to the site to test it with your PC?

If only one user is experiencing this issue, it's likely a problem with that user's PC. If all users are experiencing the same problem, it might be a local network issue.
I suggest you go and test it on-site.

Thanks.

ZHU

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The year B.C. 36 on at

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Does the customer have a very slow internet speed? Ran into this issue when a company was using a cheap residential internet connection.

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MU-19110921-0 18 on at

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Thank you very much for all your replies.

All the users at the customer are experiencing the same thing. My first suspect was the internet connection. The Azure Latency Test was done by the customer on one of their computers and on their wifi. The test looks good, so does that mean that the internet connection if clear of all charges?

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Pallavi Phade 5,420 Super User 2026 Season 1 on at

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Namaste @MU-19110921-0

There are several checks for system slowness . Can you verify below

1) Any heavy customization done on that page

2) Does this happen for all users or specific user or specific laptop or computer ?
3) Does this happen in sandbox or production

4) Does this happen at month-end or when there is work-load ?

5) Does this happen if there is bulk data inside the Order ?

6) Does this happen if there is slow connectivity or Internet issue ?

7) Can you check client side CPU/ memory usage ?

8) Any complex Triggers written at the post trigger or on page events ?

9) Can you verify if we disable invoice discuount calculation , does it work fine ?

It might be one of reasons , if not ask user to single line entry and verify for simple item

Warm Regards

Pallavi Phade

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Valentin Castravet 32,152 Super User 2026 Season 1 on at

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No. The Azure Latency Test isn’t enough. I would start with a regular internet speed test instead, just Google ‘internet speed test’ and run it. What speeds do they get? I’ve had Business Central run extremely slow when I was on bad Wi-Fi and my internet speeds were terrible.

Also, are the users located in Europe, or are they somewhere else? i.e. if they're halfway around the world from the Azure region where the tenant is hosted I've seen it be pretty slow as well.

Valentin Castravet
Work: Zander ERP Services
Blog: Dynamics 365 Business Central Insights
LinkedIn: www.linkedin.com/in/valentin-c-0500a247/

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YUN ZHU 99,055 Super User 2026 Season 1 on at

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Try the following test first.

Dynamics 365 Business Central: Troubleshoot connectivity

https://yzhums.com/27930/

Thanks

ZHU

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Rishabh Kanaskar 6,219 Super User 2026 Season 1 on at

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Hi,

Are there any custom extensions or invoice discount rules active in this environment? If yes, can you temporarily disable them and test performance?

Thanks

Rishabh

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Gerardo Rentería Ga... 25,555 Most Valuable Professional on at

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Hi, good day
I hope this can help you, and give you some hints.

Performance Tips for Business Users - Business Central | Microsoft Learn

Best Regards
Gerardo

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Morten Andreasen 4 on at

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I'm a BC partner and we have three different customers experiencing the same issue. We suspected that it was in relation to one of our apps, but there isn't a single app installed by all three customers. They have all enabled "New Price Experience" (which most of our customers haven't done yet) and we now very much suspect that the issue relates to that feature. Does the customer in question has this feature enabled?

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