proftpd - slow to list files

i have seen threads about proftpd being slow to login on cpanel servers, but i have a slightly different problem. my login seems to go fine, but it sometimes takes a long time to list the files.

it can take 30 seconds to one minute to list files - but not always,
the problem is intermittent.

any ideas about fixing this?

thanks.

 

 

 

 

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