I complained to my plumber about the low flow in a faucet last time he was out - and he said, ‘I can fix that’ and a few minutes later the flow was fixed. I should have asked him what he had done...
All of the new faucets I have installed have stupid 1/4” (might even be smaller than 1/4”) supply lines built onto them. They get plugged often. I disconnect them from the angle stop and disassemble the faucet and Blow them out with high air pressure into a container from the faucet side. Then I bleed the supply side into a bucket and observe for any debris.