The 49UH650 has one of the slower high frequency rates (only 100 hertz) amongst comparable spec televisions of this age. The high frequency rates of 4K and 8K TVs that have been around for more than a year range from 50Hz to 3,000Hz, and the average high frequency rate is 520Hz.
We compared all the other 100Hz refresh rate TVs to this TV and we think cheaper TVs such as the Sony KD-55X8509 (£429.99) is also worth considering.
If this TV high frequency rate is too slow for you then you might want to consider the Sony 55W809CBU (£449) (1,000Hz and cheaper).
What does "high frequency rate" mean?