Across all the TVs of a comparable age and type to this television the high frequency rates range from 50Hz to 1,600Hz, and the average high frequency rate is 220Hz. When compared to other comparable spec TVs that are a similar age to this TV, the high frequency rate of the LG 42LB550 of only 50 hertz is one of the slowest.
There are a number of other 50Hz refresh rate TVs currently available which you might want to look at including because of its better review score, the Samsung UE40EH5000 (£249).
If you want a television with a faster high frequency rate then you might want to look at the LG 49LB5500 (£289) (60Hz and higher rated), the Hisense LTDN40D36 (£249) (60Hz and higher rated), or the Philips 40PFH4100 (£269.99) (60Hz and higher rated).
What does "high frequency rate" mean?