Many fans of Opera browser were depressed by the change of the engine from Presto to Blink in 2013. The loss of a huge amount of functionality that made Opera Presto a unique browser, a much greater gluttony of RAM in the Blink version - these are two main reasons for the resentment of old users.
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Also, the developers once again urge to upgrade to the latest version of Opera Blink, because with the support of new technologies it is somewhat better than in the lost (unfortunately) full support of the Opera Presto developers.