Slow processing documents by Solr

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Hi Everybody

I hope you can advise me about processing documents by Solr, it does it extremely slowly in the queue, it takes about 1-3 seconds per document without attachment. I have about 300-500 thousand documents to modify, recently when I filled the queue with 80 thousand, it was unloaded for 4 days: /

My configuration:
Webcon 2020.1.3.434

Solr (version 8.3.0) info from dashboard:
Physical Memory (63%) - 32GB
Swap Space (48%) - 36GB
JVM-Memory (54%) - 8GB