Build a small comparison
Try two unrelated, familiar websites. If only one is slow, check that service's status or try again later. If every site is affected, compare another device on the same network. A problem shared by several devices points towards the connection or service, although it does not identify the exact cause.
Next, compare a simple page with the web application where you noticed the delay. A large spreadsheet or a page with many video elements is a different workload from a plain information page. Record whether the delay concerns initial loading, typing, scrolling or saving. This prevents a network complaint from being confused with an unresponsive editing interface.
Reduce the browser's workload
Save unfinished work and close tabs you no longer need. Restart the browser using its normal controls. Check for an official browser update and complete any required relaunch. A large collection of restored tabs can immediately recreate the original load, so test with a small set first.
Review extensions, especially ones added shortly before the problem. Disable one optional extension through the browser's extension manager and test again. Keep a record so you can restore it. Do not remove required work security components or organisation-managed settings without approval from the administrator responsible for them.
An additional clean profile can help compare behaviour without deleting the existing profile. Use a harmless website and avoid signing in or importing all extensions immediately, as that would recreate the same environment. A different result narrows the investigation; it does not prove the original profile is permanently damaged.
Treat clearing data as a specific action
Cached files, cookies, saved passwords and browsing history are different categories. Read the chosen categories before confirming. Clearing cookies can sign you out, and deleting saved credentials can remove information you still need. Confirm account recovery and save active work first.
If one site is affected, use the browser's site-specific controls where appropriate instead of deleting all browsing data. Follow that service's official troubleshooting instructions. Do not disable certificate checks or security protections to make an error disappear; the error may be describing a problem unrelated to performance.
Know what to report
For a recurring fault, record browser version, affected URL without private tokens, timing and the result of the comparisons. Note whether it happens in a new profile or only with an extension enabled. If a web application loses edits, keep a separate copy of important work while the issue is investigated.
The best next step follows the pattern you observed: the website operator for one failing service, network troubleshooting for several affected devices, or browser support for a reproducible local problem. A factory reset of the computer is rarely the first useful response to a slow page.
