Adding a new object that uses the particle rendering method is a classic micro-optimisation. As I described before it makes a difference on the order of a few hundred nanoseconds per object. I honestly doubt many real-world games would be meaningfully faster with the particles rendering method. Meanwhile it complicates the engine, since you more or less end up with two kinds of sprites, which confuses beginners ("which should I use and why?"), and it means more time to develop and maintain, when we have far more compelling things to be working on. Wouldn't you prefer us to do advanced text features or a built-in canvas plugin or other more useful things like that? We're a small team and we can't do everything. These are the things that would fall by the wayside if we chased benchmark results.
This is how benchmarks can actually have harmful consequences if you slavishly follow maximum performance at the expense of everything else.
Would it be possible for users to commission updates for Construct 2, Would it be possible to pay 1,000$ or so towards a new native feature?