Comment # 11 on bug 1166965 from Jiri Slaby

From IBS:

Standard kernel
Devel:Kernel:stable/kernel-docs/standard/x86_64
 Maximal used memory: 7096 Mbyte 

With sphinx from leap 15.2
home:jirislaby:kernel_docs_sphinx/kernel-docs/SUSE_Factory_Head/x86_64
 Maximal used memory: 1830 Mbyte

With python 3.7
home:jirislaby:kernel_docs_python/kernel-docs/SUSE_Factory_Head/x86_64
 Maximal used memory: 7593 Mbyte 

So there is little difference between py 3.7 & 3.8.

There is a huge difference between sphinx 1.7.6 and 2.4.4.