This patch solves the problem of HTML sanitizer being too slow. After HTML is generated it is stored in a separate Cachex storage with 2500 entries limit.
Testing it with 4 MB text it was able to parse it in 14 minutes with 50% load on i7-6700, requiring 1.4 GB of ram. After that it was able to display it instantly
No more carrots?
Closes #481 (closed)