①I create new space in confluence data center
②Upload about 3000 attachment in home page
③Create many child page
④In child page, add new link attachment of home page
⑤In home page, i edit new page title and save page → i can't save it
In my source, if i using page manager rename then result is same. (replace link very slow)
how to fix performance when using renaming page, which multiple links?
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3,000 attachments is probably the problem. Confluence is not a file storage system, and attachments are intended to be used as supporting documents for a page (mostly images or the odd short document which the pages can render part or all of). Pages expect to have a few attachments, maybe a few dozen (or a couple of hundred for widely shared attachments), not 3,000.
Why have you attached 3,000 files to a page?