To optimize performance with large mailboxes, the inbox should be kept as small as possible. This can be achieved by structuring the mailbox with subfolders, which not only increases the speed of accessing emails but also boosts productivity. The inbox is fully synchronized, including all emails and attachments, which can cause delays with large inboxes. Other email folders by default only synchronize the headers, as these data are not accessed regularly.
To achieve optimal performance with larger mailboxes, please keep your inbox as small as possible. Structure your mailbox with appropriate subfolders to ensure that your mail data can be accessed quickly at all times, and such an organization system leads to higher productivity.
"The data is still there - so why can performance be improved by archiving?"
The inbox is always fully synchronized, meaning all emails including attachments are also stored locally. Depending on the inbox size, this can lead to slight to significant delays when retrieving emails. For all other email folders, only the headers are synchronized by default, since these data do not necessarily need to be accessed regularly.