Update time analysis

[suquark]

Why are these changes needed?

Update time analysis:

• 30x faster data processing
• consider judge time normalized by number of chars
• more plots
• filter votes by judge time

Related issue number (if applicable)

Checks

• [ ] I've run format.sh to lint the changes in this PR.
• [ ] I've included any doc changes needed.
• [ ] I've made sure the relevant tests are passing (if applicable).