How to Solve Thunderbird Running Slow Issue? Best Guide!

Sophia
Published: Feb 13, 2024 • 5 Minutes Reading

Mozilla Thunderbird is a very popular, free, and open source platform for users that offers management of email communication with the support of various features. It has a user-friendly interface, spam filter, encryption, etc. making it a versatile solution for personal as well as professional use. However, many users face Thunderbird running slow problems and want a workable solution for the same to resolve this issue.

Therefore, as a solution, we will be discussing the top solutions to resolve the Thunderbird slow with large mailboxes problem with complete accuracy and data security.

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Thunderbird Slow Downloading Messages? Know Possible Reasons

Many users complain that Thunderbird freezes when downloading messages, this problem can occur due to multiple reasons, let us discuss some of the most common of them here.

Over time the number of emails increases and so does their size, also the related attachments contribute a large portion to the occupied storage space. Hence, to solve this Thunderbird running slow issue, users should consider either deleting or a better option, saving their emails to improve the email client’s speed.
Slow or unstable internet connection is one of the primary reasons to ensure that your system is connected to a stable network and has sufficient bandwidth for the email client’s performance relatively fast.
Sometimes, the mail server itself is quite overloaded resulting in Thunderbird slow downloading messages. In order to resolve this problem contact your email service provider or consider using a different server or optimizing your email settings.
There can also be an antivirus or firewall interference that may be causing performance issues for the Thunderbird email client, hence, temporarily disable the antivirus or firewall software and check if the performance improves.
It might be the case that you are using an outdated version of Thunderbird or have some add-ons and extensions that can create performance issues. As a solution, update your email client to the latest version to eliminate any bugs and disable unnecessary add-ons or extensions in order to improve its speed.

Solve Thunderbird Running Slow Problem with Free Online Solution

We have discussed various reasons why users might be facing Thunderbird performance issues, but the manual methods for them don’t guarantee its solution. So, how to speed up Thunderbird? Users can take the help of Online MBOX Splitter, a free online solution that allows them to split MBOX files of any number and size into small parts with the help of various split settings.

As you know, all the email data in Thunderbird is stored in the MBOX format and hence it is best to split them and create a backup without deleting your data. Let us understand how you can do that with the help of the below mentioned step by step method in an easy and accurate way.

Visit the online solutions’s page and click on the box to “Select Files” or drag and drop MBOX files from your system.
Now, choose from the available “Split Settings” (by year, sender, and size) to divide MBOX files as per your requirements.
Next, click on the “Split MBOX File” button in order to download the resultant MBOX files on your system.

Top-Notch Features of the Online Solution

The above discussed online solution has a lot of top-notch features that make the process of solving Thunderbird running slow problems effortless, let us discuss a few of them.

The online solution provides multiple split settings to users (by sender, size, and year) to divide their MBOX files in a completely free and secure manner.
It has a very intuitive user interface that allows users to conveniently divide their MBOX files on all devices and platforms such as Windows, Mac, Android, Linux, Ubuntu, etc.
This free service can divide any number and size of MBOX files while maintaining their original folder structure and email metadata along with related attachments.

Thunderbird Slow with Large Mailboxes? Use this Professional Software

You can also take the help of BitRecover MBOX Splitter Wizard, an offline solution recommended by experts to divide MBOX files into smaller files by date, size, and email addresses. The tool creates a preview of the emails in the selected MBOX file and also provides a search option in case users want to search for any specific emails.

It divides MBOX files while preserving the email components and is compatible with MBOX files from multiple sources such as Apple Mail, Thunderbird, Opera Mail, etc. Users also get the option to save the resultant MBOX files at a specific location as per their choice on both Windows and Mac OS.

select required split option

Also Read: How to Solve Thunderbird Not Downloading Attachments Issue?

Conclusion

In this article, we have discussed the possible reasons for Thunderbird running slow and the top solutions available to resolve this issue. Although the manual methods are very generic and might not resolve the issue completely, therefore, users can take the help of the online solution discussed above. It can divide your MBOX files of any size and number with multiple split settings and is also compatible with all devices and platforms such as Windows, Mac, Android, Linux, Ubuntu, etc.