Hello,
Why Slow Time to Last Byte of the HTML File Results in Bad User Experience?
A web browser gets first the HTML file that includes all the references to the assets, which need to be downloaded sub-sequentially. The browser will not start downloading any asset without the HTML file. Web browsers may start downloading assets while receiving first bytes of the HTML file. Therefore, time to first byte (TTFB) has an important role as well. However, in most cases – if not all – content on the website can be blocked from fetching until the HTML has been fully downloaded. Therefore, TTFB is as important as TTLB.
Here is a list of the most common issues:
Inefficient code on the origin server
Database design results in slow queries (indexes, commits, stored procedures, etc)
Misconfigured webserver (Apache, Nginx, PHP, Ruby, MySQL, MongoDB, sysctl etc.)
The origin server reached its capacity (CPU, memory, disk i/o, etc.)
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Regards
Deepak