If something is unbearably slow in Beta, it needs to be pointed out.

His muscles ached from the strain he'd put them through, and his movements seemed unbearably slow and sluggish.

Vecher put the tube to his lips and took a deep, unbearably slow breath.

But keep in mind that in its initial incarnation, Aqua was unbearably slow and a huge resource hog.

I was unbearably slow.

Some shifts can be unbearably slow.

This time his head-shaking was unbearably slow.

For them, human walking speed was an unbearably slow crawl.

Malware programs are usually poorly-programmed and can cause your computer to become unbearably slow and unstable in addition to all the other havoc they wreak.

Service: Cheerful but scattered, often unbearably slow.