Thank you for your question. Since webmail uses IMAP to connect to the server, this means the emails are stored on the server.
You can keep lots of mail on the server, but when it's all stored in the main Inbox folder, all of the message headers need to be synced to your mail client each time it checks for new messages, and this can lead to a lot of resource usage, and slow load times.
Moving emails to different folders, so they are not stored in the main Inbox is the easiest way to correct this issue. I recommend reading this helpful article, that provides this and several more solutions.
If you have any further questions, feel free to post them below.
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