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When the flags G1HeapWastePercent and G1MixedGCLiveThresholdPercent were introduced their default values were picked without much performance analysis. Recent performance runs indicate that G1HeapWastePercent often benefit from a lower value and that G1MixedGCLiveThresholdPercent benefit from a higher value. Suggestion is to change the default for G1HeapWastePercent to 5 (used to be 10) and G1MixedGCLiveThresholdPercent to 85 (used to be 65).
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