Hi Amit,
Thanks for the samples.
2. Please find attached the modified sample (WindowsApplication10) which shows almost same time duration to load the points using the direct approach and implementing interface. Your way of measuring the time is correct. I have included the necessary codes to make the chart to plot faster. It will help you to render the chart faster in case if you are using any advanced features like styles, tooltips etc.
3. I feel sorry for misunderstanding the problem. To set the minimum and maximum and let the interval to set automatically, please try setting the Min and Max properties of the particular axis. Please find attached the modified sample WindowsApplication14 which illustrates this.
syncfusionExamples01.zip
4. Please try setting the format of the axis as "0%". This will let you to display the axis labels in percentage including 0.
Kindly let me know if this helps you.
Regards,
Geetha