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The second key improvement is the reduction in memory consumption during background parsing.
Currently, Chrome’s parser has a tendency to keep zones alive longer than necessary. By changing the duration which the parser keep zones alive, this allows Google to reduce the average and peak memory usage in Chrome.
What this all translates to is simple: Chrome 55 will use considerably less memory compared to the current version, Chrome 53.
That said, only low-end devices will see any actual improvements in performance. Whatever the case, you should still update to Chrome 55 when it goes live on the 6th of December.
Source: The Chromium Project