Der har været fremført bekymringer for at enhedernes ydeevne ville forringes mærkbart af disse sikkerhedsopdateringer, eftersom de betyder at skift mellem processer bliver langsommere,<ref name="theregister2018">{{cite web|url=https://www.theregister.co.uk/2018/01/02/intel_cpu_design_flaw/|title=Kernel-memory-leaking Intel processor design flaw forces Linux, Windows redesign|authors=John Leyden, Chris Williams|date={{date|2018-01-02}}|work=theregister.co.uk|access-date={{date|2018-01-12}}}}</ref> men de første [[Benchmarking|målinger]] har næsten ikke vist nogen forringelse.<ref>{{cite web 
| title = Industry Testing Shows Recently Released Security Updates Not Impacting Performance in Real-World Deployments | Intel Newsroom 
| url = https://newsroom.intel.com/news-releases/industry-testing-shows-recently-released-security-updates-not-impacting-performance-real-world-deployments/ 
| publisher=Intel
| date = {{date|2018-01-04}} 
| access-date = {{date|2018-01-12}} 
 }}</ref><ref>{{cite web|url=https://www.phoronix.com/scan.php?page=article&item=linux-415-x86pti&num=1|title=Initial Benchmarks Of The Performance Impact Resulting From Linux's x86 Security Changes - Phoronix|date={{date|2018-01-02}}|first=Michael|last=Larabel|work=www.phoronix.com|access-date={{date|2018-01-12}}}}</ref><ref>{{cite web|url=https://www.phoronix.com/scan.php?page=news_item&px=x86-PTI-Initial-Gaming-Tests|title=Linux Gaming Performance Doesn't Appear Affected By The x86 PTI Work - Phoronix|date={{date|2018-01-02}}|first=Michael|last=Larabel|work=www.phoronix.com|access-date={{date|2018-01-12}}}}</ref>
Datalogi Teknologi Matematik