If your SSL needs are simple, there are many fantastic, light-weight alternatives to WordPress HTTPS such as:
<a href="https://wordpress.org/plugins/really-simple-ssl/">Really Simple SSL</a> (great for securing the entire site)
<a href="https://wordpress.org/plugins/ssl-insecure-content-fixer/">SSL Insecure Content Fixer</a> (great at fixing most insecure content errors)