Comment #9 on issue 3778 by [email protected]: How to tune semi-space size for minorGC
https://code.google.com/p/v8/issues/detail?id=3778

The pauses are really long :/
Many objects survive the young generation. The survival rate is often above 50% which means that 50% of the newly allocated objects are copied to a different location in memory. Can you find out which objects survive and if they really have to survive? Make sure that you don't allocate too much while rendering. You could consider recycling objects instead of newly allocating them. Use integer values that can be represented in 31-bit signed integer (they do not require a wrapper object). Double values are sometimes boxed as well. Avoid new, literals, and strings in the critical rendering path.

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