Refresh rate describes display updates
A 60 Hz display can present roughly 60 refreshes per second, while 120 Hz and 144 Hz displays refresh more often. Higher rates can make scrolling, cursor movement and games appear smoother.
Measure the browser’s observed rate
Run the Refresh Rate Test. It samples requestAnimationFrame timing, which is a useful browser-level estimate of the active refresh rate.
Check resolution too
Refresh rate and resolution are separate settings. Use Screen Resolution to see the display/viewport dimensions and Dead Pixel Test to inspect the panel itself.
Why a high-refresh monitor may show 60 Hz
The OS can be configured to use a lower rate, some cables/adapters cannot carry every resolution-rate combination, and power-saving modes can reduce refresh behaviour.
Try the tools: Links in this guide point to free MyLaptopTools utilities that are relevant to the topic.