I was thinking perhaps my 5400 hd was just not accessing the info for drawing fast enough.
That doesn't sound likely in case of a laptop. That would mean that your other components were super fast compared to the hard disk. That's not the way laptops are built. In an imbalanced Frankensteinian self-build that could be the reason.
There's one thing, though, that could possibly cause slow hdd related issues, but then the entire computer would be slow, not just AH. I mean, if a hard disk starts failing, or if Windows thinks it might be, Windows will drop the speed rating of the hdd. In the days of IDE/PATA disks there was a DMA rating in DeviceManager\IDE ATA-ATAPI controllers\Primary IDE channel\Advanced. Early SATA disks emulated that feature, too. If the value was below UltraDMA 6 (or 5 on older/slower computers) the computer would not act at normal speed. Resetting the hard disk speed rate is a piece of cake: Just remove the Primary ATA or SATA channel in the Device Manager, reboot and let Windows reinstall it along with all disks attached to it and reboot again when asked to. Worth trying... If that fixes the problem, it'd be time to do some more serious testing on the hard drive, not to mention to take extra backups in case the disk would fail any moment.
Since it's a laptop, I won't mention the PSU

BUT, since it's a laptop, how about the dust bunnies in the cooler system? Modern CPU's slow down if they start to run too hot for the cooler to handle. Clean the cooler fins and ensure that there's space enough under the laptop.