WebPageTest is a powerful online web performance testing & analysis tool that has been adding a lot of interesting new features. Their list of test locations to check a page from is growing (currently 17) & now includes Delhi, India. It makes it easy to do "what-if" testing on production pages by showing what performance gains can be achieved by removing ads, widgets, JavaScript. It looks simple on the surface but once you start poking around Advanced Settings & see its analytical review of web pages you test, you'll wonder how it's even free.
I highly recommend this tool to web developers who want to improve performance of the web pages they build.
If you never tried this tool or gone through it superficially, check Patrick Meenan's video to get started and learn directly from the creator of the tool.