| F | ↗ | D | UTF8::utf8_decode() improved |
| B | ↗ | A | UTF8::to_iso8859() improved |
| B | ↗ | A | UTF8::fix_simple_utf8() improved |
| B | ↗ | A | UTF8::fix_utf8() improved |
| D | ↗ | C | UTF8::stripos() improved |
| B | ↗ | A | UTF8::is_json() improved |
| C | ↘ | D | UTF8::str_to_words() got worse |
| D | ↘ | F | UTF8::strlen() got worse |
| B | ↘ | C | UTF8::str_split() got worse |
| B | ↛ | UTF8::number_format() removed |