pvs-studio check

[boris768]

fullhtml.zip

that is sick
as example, 1/2 (or (int)1/(int)2) equals zero.
Much warnings is false, but some are definitely bugs

[LegendaryGuard]

Very nice, PVS Studio seems a big help to analyze the project.
I suppose these clues can help to progress and complete the tasks of improve performance and fixing bugs where README says.

I think improve performance task would be the highest priority, sometimes it can be mixed with the fixing bugs task.

Going deeper about this task, it would be better to start looking and fixing physics (it would be the first, I guess sometimes there are lags, isn't it?) and memory management (possibly there are leaks or unnecessary assignments and excesses).