For 4.4.2, KingRoot exploited several now-patched vulnerabilities (CVE-2014-3153, TowelRoot exploit, etc.), making it extremely effective.
Use of specialized tools to hibernate background processes and improve responsiveness. kingroot apk android 442 portable
Use apps like Greenify or Titanium Backup to manage system resources. Customization: kingroot apk android 442 portable
Released in June 2014, Android 4.4.2 is an iteration of the Android operating system. KitKat introduced several refinements to the Android experience, with a focus on performance and UI enhancements. Despite being older, many devices still run on this version, and rooting such devices can breathe new life into them by enabling newer applications or custom ROMs. kingroot apk android 442 portable
Safety recommendations