Please let me know if I understand this correctly:
The coin with the highest "24hr effect on index (weighed)" = is it the best performing?
But would that be in the last 15 minutes - since the chart is updated every 15 minutes?
Not really, It just means that the INDEXWEIGHT*COINPERFORMANCEOVER24HOURS is the highest. So a coin with 1% that moves 5% will have 0.05% influence. If a 10% coin moves 10% it will influence the index 1%.
This new stat is always comparing prices now to the prices exactly 24 hours ago.