Help Center/ Cloud Certificate Manager/ FAQs/ SSL Certificate Download, Installation, and Use/ SSL Certificate Troubleshooting/ Why Does the HTTPS Access Speed Become Slower After an SSL Certificate Is Installed?
Updated on 2024-12-13 GMT+08:00
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Why Does the HTTPS Access Speed Become Slower After an SSL Certificate Is Installed?

After an SSL certificate is installed, HTTPS requires several more handshakes than HTTP during website access. The handshake phase of HTTPS is time-consuming, and RSA verification is required. Therefore, the access speed of HTTPS is slower than that of HTTP after SSL certificates are used.

In addition, processing workload of the CPU of your server is increased slightly because each SSL connection needs to be encrypted and decrypted.

To reduce the pressure on the server, do the following:
  1. Use SSL only for pages that need to be encrypted, for example, https://www.domain.com/login.asp. Do not use https:// for all pages, especially home pages with the largest number of visits.
  2. Avoid using large-sized image files or other files on pages that use SSL. Use concise pages with few images instead.