[Media Viewer] Performance on clicks is slow

[mahalakshme]

https://avni.freshdesk.com/a/tickets/4775

Issue:

On clicking MediaViewer and on clicking a image - take around 1 min to load.
Some users feel this used to take only around 5 seconds before

AC:

The below actions(basically any action in Media Viewer) should not take more than 5 secs to load

• On click of 'Media Viewer' box in home page
• On click of an image in Media Viewer
• On selection of any filters and on clicking 'Apply filter' on Media Viewer
• Validate the above performance improvement using gatling

Technical suggestions:

• Clicking on an image/media we need not again call /et/media/search? since we would already have the pre-signed image URLs to fetch or if it has got expired can fetch the pre-signed URL for that image alone.
• On moving across each image on the carousel additional fetching of consecutive images can be done, instead of fetching everything in one go
• When rendering the full page, pre-signing images link for thumbnails should suffice, instead of pre-signing original image link as well