Hi, goldiesehgal!
I can see that the slider is working already on your homepage:
– Screenshot: https://d.pr/i/go1fHh
Could you confirm everything’s working correctly?
Regarding the PageSpeed loading time – I didn’t notice anything wrong from my end while loading your site (it loads fast and okay) but it’s true that the scoring in PageSpeed is a little low. PageSpeed mentions that it’s mainly because of “too much JS”.
Google and their “speed tools” which are used among thousands of people to “optimize” their sites, unfortunately, what these tools measure is not really site speed, but are measuring optimal speed and your site deviance from this, and the rules to reach that objective cannot be always followed, for example, some CSS and JS has to be rendered at the head of the page so that things would work correctly on your site, this is not really an issue but how some things work, still their tool will tell you this is an issue.
If we take a look at Google’s own Blog – https://developers.google.com/speed/pagespeed/insights/?url=https%3A%2F%2Fblog.google%2F, then we can see that their own scores very low as well. Fortunately, that does not mean that the code they are using is bad or that the speed of the website is not great. It just means, that certain things are not done in a certain way, because it can not be done in that way or it was better to do them in a different way.
You can try to reduce the loading in MailPoet by disabling the Load of 3rd-party libraries in MailPoet -> Settings -> Advanced, but please note that your speed core might stay similar even by doing that.