federation shares with many directories / files slow down navigation

[ferdiga]

NC 20.08 and 20.0.4

federation sharing seems only to perform with a very low number of shares and directories.

once sharing
find . -type d |wc -l
1342
find . -type f |wc -l
6241

navigation operations become so slow to become "unusable" - response time 4-5 minutes.

"mounting" a federation share remains in state "Pending" for a long time until it displays the size of the mounted share.

I guess that the calculation of the size of a folder is redone every time the folder is accessed and is not performance optimized.

Example
Trying to move a 1kb file from such a shared folder to a local folder causes a delay of displaying the target directories,

• the first choice obviously is the the source directory, where the file resides - the size is calculated
• the second choice is the the parent of the source directory, where the file resides - the size is calculated again
• the 3 choice is a local directory - this works reasonable fast.

[sunjam]

This has also been by experience as well when mounting Nextcloud or WebDAV shares to external storage. #8459 could help with this... being able to optionally keep a copy of the federated share on your local server rather than constantly attempting to access it.

[szaimen]

Duplicate of #4339