Best Parallel Sending Configuration For My Server

Hey guys,

Need some help here.

I am using MailWizz on a LiquidWeb VPS with 1 GB RAM, Single Core Processor. What's the best parallel sending configuration for my server? By configuration I mean optimal number to enter in the number of parallel processes for each campaign at Backend -> Settings -> Cron.

Going with the default numbers, my server got overloaded and a lot of emails were getting queued and resent and had a lot of headache to say the least.

Cron sending speed is just not enough (taking 5 minutes to mail a 4k list :( )

Can anyone chim in please? @twisted1919 ?
@ Sam : You have only 1 GB RAM and Single core, how much Speed you are looking for with this config ?