javascript - d3.js load data dynamically -

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i have file 5 variables , data 10 years. each year has 8000 data points (for every hour of day in year) each variable. when use these data (8000*10*5 = 400k) create interactive line plot using d3.js, there delay in loading viz. similar http://bl.ocks.org/dstruths/9c042e3a6b66048b5bd4 .

to make plots load faster, can query average of day every year every variable , plot them, begin with.

my questions if want zoom in day , 8/1/2010, how can query database hourly data of day? database using cassandra , using node.js query cassandra.


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