Apparently beginning with Firefox Quantum 57 (and subsequent releases) many users are intermittently experiencing a long delay during the TLS handshake process when loading a page. I've found multiple threads discussing it on various sites with potential solutions provided including creating a new Firefox profile, doing a clean install, changing FF proxy settings, conflicts with security software, and many others. I've tried most of the suggestions and the only one which worked for me was to go to the about:config page in FF, search for the 'network.proxy.proxy_over_tls' entry and set it to false. The intermittent TLS handshake delay is now gone and my page load times are consistently fast. I thought I'd share it here in case it might be helpful to other forum members using FF, and also to ask whether anyone is aware of potential problems changing that setting accordingly may cause. TIA!