I may be being naive (i.e. assuming he is not getting thousands of USD, EUR, GBP or equivalent every month through his sponsors), but a real heavy duty render farm (a bunch of machines or servers with rendering cards, the software to use them, optimised configuration also of local network), takes lots of money and some knowledge, though for Iray, an Iray server license is less expensive than what one could think.It's also rendering though. He refuses to build a render farm and only renders at night, while he works on the same machine during the day. His entire work flow is a mess, from top to bottom.
Not trying to defend him, just referring to a fact.
On the other hand, I have to admit, one can get very good rendering performances in terms of hardware and reduced speed, just by spending a bit of time to search and then buying a second hand workstation, a bit of extra memory and a couple of second hand GPUs cards to stick in, even if they are not the latest greatest model, all in all for a few thousands (I don't dare to say less than 3, but even considering some M2 disks and a bit of memory, should I think be less than 5k, though I mean EUR, it is a bit more in USD, a bit less in GBP).
I am not considering the way different renderers interact with hardware, I use Iray or occasionally for a preview Filament, but as far as I remember Blender with both eeve and cycle can also use NVIDIA hardware like the one I have - so, yes, I am not just talking out of theory, I did that process over time to build the machine I am using to write this (though the cards originally where not meant for rendering, but another purpose, though also nothing to do with "mining"
On the other hand, his work is good quality, people continue to pay him and I guess someone will reply saying he gets thousands every month, so, he probably does not feel too motivated in speeding up things, for fear of not finding another character and story he can make money out of for a long time
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