Slackware-14.2 currently provides curl-7.64.0. This version of curl has a regression which causes problems in some applications (notably rtorrent, where it manifests as 100% CPU usage):
https://github.com/rakshasa/rtorrent...ment-478775500. Updating to the latest stable version of curl is reported to fix the issue.
Please consider updating curl to version 7.64.1 in Slackware-14.2.