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Date: Tue, 16 Mar 2021 09:14:50 +0100 (CET)
From: Dietmar Maurer <dietmar@proxmox.com>
To: Proxmox Backup Server development discussion <pbs-devel@lists.proxmox.com>, 
 Dominik Csapak <d.csapak@proxmox.com>
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Subject: Re: [pbs-devel] [RFC PATCH proxmox-backup 3/3] tools/zip: compress
 zips with deflate
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> @Wolfgang, could you please look at this? I am not sure about using
> the Compress in an async function. It is only in memory, but does it
> 'block'? i am not sure how we could do this differently in an
> async context though...

Compression can use 100% CPU, so you should move that to a separate thread ...