It is an interesting question and it can be viewed from several perspectives, and here's another one, in more general terms
While performance can be easily defined and measured (mostly), "increased" or "successful" performance is already more difficult to define ("increased" as compared to what, and "successful" to what extent - is winning necessary, or is grabbing a silver enough), while pressure raises even more questions - do we speak of "objective" pressure as defined by external factors (e.g. high stakes), or subjective pressure as experienced by any given athlete themselves which is much more elusive. Here external assessment and subjective experience could be very different. Do we need an athlete to actually
feel the pressure in the clutch situations, or do we define the situation ourselves as high pressure, no matter what
they actually think about it and how they
feel?
Internal removal of a high stake goal (for example, "
I don't care if I win, I'm here just for fun" , or "
let's pretend it is just practice") have been long described as a stress management technique (and we heard about them from skaters, too - Alysa Liu may be a perfect example of the first approach, and I think it was Hase /Volodin who explicitly reported having agreed on using the second one, i.e. "
let's pretend...", for their Olympic free skate in Milan). Of course, it can be more or less successful in any given case. But if internal goal is successfully removed on the subjective level, can we still talk about a high pressure situation or not ? Do we think Alysa was under pressure or not? After all, she claims not to care for placements but hers was the last chance to win individual OGM for US when everyone before her had failed. So, what do you say?
OTOH, the acute awareness of a high stake goal may be quite motivational, and depending on the physiological type, a high stress level may actually
increase the level of performance before it starts to
hinder it - and the point of shift is actually very different in different individuals. Here's Yuzuru's "
I like to win with some drama" comes as a handy example. Is the clutch performance then what happens in any given point of a high pressure situation, or beyond the point where stress becomes interfering with performance, but the athlete is able to manage it and perform great nevertheless. Hmm....
Anxiety as a physiological and therefore measurable indicator of stress is often used in research to measure pressure actually felt by athletes.. But... Yuzuru reported the first time he
ever felt performance anxiety was GPF 2015 in Barcelona, and not because of any objective stakes, but because he had achieved a score perceived as unthinkable of (breaking 200 points for free skate and 300 points in total) two weeks earlier in NHK (
https://wherespacepooh.tumblr.com/post/165776941514/yuzuru-hanyu-comments-on-his-own-iconic , with English subtitles) . It was the pressure of having to perform to keep up or even exceed his own score that made him feel competition fear for the first time in his life. He performed exceptionally well in Barcelona in these circumstances breaking his own previous record and providing performance by many believed the best ever in the history of the sport. But let's be honest, any definition defining the pressure in external terms, would put Sochi Olympics before 2015 GPF, while his own subjective experience would order them differently. Which one is correct, what do you say?
Just an example of how complicated the OP's question in fact is, if you really want to take a science-based approach and not just a conversational one, - as different researchers give different answers to any of these questions
Here's a paper discussing the notion of "pressure", enjoy and reflect!
Exploring the “clutch” in clutch performance: A qualitative investigation of the experience of pressure in successful performance
And a paper reviewing the existing research on clutch performance from different perspectives, if anyone's interested.
Clutch Performance in Sport and Exercise: A Systematic Review