Hi @estherramos
Yes raindrops theme support responsive design.
Responsive design is a way to distinguish between mobile display and PC display mainly using CSS.
However, this method changes the design but does not change the amount of data transmission / reception.
For mobile devices with low throughput, the display will be slow.
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The display speed is most affected by the display speed of the page, depending on the contents such as video and image content.
Be sure to logout status when measuring display time with Raindrops theme.
The basic recommendation is,
cache plugin
https://www.ads-software.com/plugins/comet-cache/
AMP plugin
What is AMP: https://www.ampproject.org/learn/overview/
https://www.ads-software.com/plugins/amp/
amp page example: https://tenman.info/labo/snip/archives/8214/amp
raindrops page example: https://tenman.info/labo/snip/archives/8214
( sorry japanese document )
Thank you.