Saw this spider as I was taking a shower. It moves really fast. This I noticed when it moved away (from the center of this splendid pattern) to repair its web.
Location: West Bengal, India.
It appears to be almost 1.5 cm in length.
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Many web-dwelling spiders are lightning-quick in their own web (even if they are slow/clumsy walkers outside of their web) so that doesn't help in identification.
Hard to tell from the photo, but it appears to be Cyclosa ginnaga
A better image of the specimen would help identify.
edit after comment:
Here is a gallery of observations (currently 50 of them) of cyclosa ginnaga: https://inaturalist.ca/observations?place_id=any&subview=grid&taxon_id=360502 All those observations were made in South-East Asia or Australia.
You could also look at Cyclosa Insulana with similar range: https://inaturalist.ca/taxa/560706-Cyclosa-insulana/browse_photos?quality_grade=any
But I think the length of abdomen in your photo more closely resembles C.ginnaga, and also the observations of C.ginnaga more consistently show a spiral in the thick webbing while C.insulana tends to be more random.
And here is a breakdown of the cyclosa genus broken down into specific species if you want to browse other possibilities: https://inaturalist.ca/taxa/127360-Cyclosa/browse_photos?quality_grade=any&grouping=taxon_id
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$\begingroup$ Welcome to SE Biology. This answer would be improved by a picture of Cyclosa ginnaga. $\endgroup$ Commented Aug 25, 2020 at 16:00