Brand new ACER Aspire 3 15 laptop slows down a TON as soon as unplugged

IcedColdTea

As the title suggests, I have an Acer Aspire 3-series laptop. This laptop was bought brand new from Costco yesterday actually, and I bought it for school purposes. This laptop as I tested today, when plugged in, runs Google Chrome, Microsoft Edge with ease. BUT, as soon as I unplug, and gave it a minute to adjust, the laptop slows down very much. I can experience a huge lag, and when checking task-manager, it seems like the CPU is locked at around 14% for some odd reason. I have another LENOVO Laptop, when I did the same testing, the CPU wasn't locked for the LENOVO one. This laptop as previously stated, was meant for school. The programs I need for it to be running is demanding, and I cannot have a laptop that runs fast when plugged in, but very slow although battery is almost full. I tried contacting ACER support, but I was turned down for, according to them "will void my warranty". Do I need to return this laptop or is there other ways?

ADDITIONAL INFORMATION: Laptop is equipped with a Ryzen 7 7250U APU processor, a 16gb LPDDR5 memory sticks, touchscreen 1080P display, and no fingerprint recognition system. The laptop was turned to "Maximum performance" in Windows 11 Configs, and the power plan is set at 80% minimum on battery, and 100% on maximum.

Puraw

@IcedColdTea

The throttling when on battery is normal (20% speed reduction). I recommend to set Edge as your default browser as Google chrome takes up a lot of memory and having both compete and update at the same time will use a lot of your resources. Likewise uninstall McAfee, Norton, Avast and the like, Windows11 Defender has the best security you will ever need. Also uninstall Office 365 trial version as there are much better deals on the web (Legacy Office Prof for life, $65). Check in Task Manager, Processes tab what is running and reduce the priority of some of the programs you don't run (with Efficiency mode). It looks like you have a lot of baggage on your drive that can be safely deleted: Run Storage Sense in Windows and scan your drive, click on the Temp bin at the bottom and it may find GBs of data like OldDos and old Windows update records that you should purge. Trim/optimize your drive and finally go online, make sure internet is working and run these 2 commands in the command prompt opened as administrator:
Dism.exe /online /cleanup-image /restorehealth
This should complete successfully, if not rerun.
SFC /scannow
This should end with Found no integrity violations, if not rerun till you see that.

I recommend that you make a USB Windows Recovery flash drive, get a 10+GB Fat32 USB2.0 flash drive and insert it in your USB2.0 port, type Recovery Drive in the Search bar and it will create the drive in 15-20 minutes. You are going to need that recovery drive.
You should also get a large external USB disk, any type HDD or SSD, as backup disk, 2-4 TB capacity and backup your system monthly after updates now your system is still fresh without corruption. Make image files of your complete disk that you can restore with that Recovery flash drive I mentioned before in Control Panel>W7 Backup> Create an Image file (don't use File History or the W7 backup option, jyst the image file option at the top left of the W7 backup window.