It's starts to seriously degrade. Removing the indicator - everything is back to normal.
Not really noticeable on small data sets (5 days of 1 minute), although some 'drag' can be sceen, but still at an acceptable speed.
Moving the slider is instant and fast.
I doubt it is related to the public Series<double> use...
Enabling global crosshairs and using a 2nd chart to scroll the first chart is faster.
MSI 15.6" WQHD+ 3K Mobile Workstation
with Intel Core i7-4810MQ (2.7 Ghz),
NVIDIA Quadro K3100M w/ 4GB GDDR5 VRAM
and Windows 7 Professional
The code here is pretty simple:
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