Of course it can, but not everyone is a developer nor has the time or rationale to learn. Also this is not open source software, it's a paid platform. IPB have a fantastic team of developers who can easily do this, I assume it just hasn't been prioritised to date. But if site owners are wanting to continue to get organic traffic from the likes of Google, it's critical these issues are addressed soon.
Fast loading sites are critical for usability:
Research from Amazon showed that every 100ms increase in load time, sales decreased by 1%
Two key studies by Akamai and Gomez are regularly cited in reports on page load speed, as both are several years old it’s likely that web users’ expectations are even higher. The Akamai study, published in September 2009, interviewed 1,048 online shoppers and found that:
47% of people expect a web page to load in two seconds or less.
40% will abandon a web page if it takes more than three seconds to load.
52% of online shoppers claim that quick page loads are important for their loyalty to a site.
14% will start shopping at a different site if page loads are slow, 23% will stop shopping or even walk away from their computer.
64% of shoppers who are dissatisfied with their site visit will go somewhere else to shop next time.
Google have been working on educating web developers and building tools to make pages load fast for years and continue to do so. E.g. Their page speed assessment tool Lighthouse, their nginx mod_pagespeed, their AMP project, their yearly IO conference e.g. [Session] Web performance made easy, the Chrome User Experience Report. etc
Page speed is also a significant factor in Google's ranking algorithms for both paid and organic search, the slower your site the more you pay, or the worse you rank. Google have been testing red slow labels for slow loading sites (attached).
I could go on and on how important this is, this should be standard practice in the development of the platform and not for users to have to modify code themselves.