Hi Artem,
Thanks so much for the speedy response, and for making your customers happy

I know it's only a small change, but Google Insights flag it as a high priority, and it's good to be able to show my customers their website has a good performance rating without any high-level warnings.
You asked for a link, was this in relation to the deferred loading? If so, I was using the following:
www.dimeto.co.uk
By only turning on the deferred loading option, according to Google Insights, the blocking increased, which caused the performance rating to be reduced from 79 -> 69
Thanks again
Marc