Computer slows to a complete hang

[Bluey]

I'm using Kubuntu 24.04 with Plasma version 5.27. I noticed this same issue both when I tested Kubuntu in a VM and live-booted it with a USB flash drive, where if I tried to do anything resource-intensive for too long, my system slows to the point of freezing. Recently I was playing Peak with a friend and I put all the graphics settings on their lowest option, but it still froze on me in the middle of our game. I was previously using Windows 10 before switching to Linux and it was able to run Peak relatively well. What do I do?

[Snowhog]

Well, you can give us the specifications of the PC you are using for a start.

[Bluey]

System:
Host: jordan-inspiron3670 Kernel: 6.14.0-33-generic arch: x86_64 bits: 64
Desktop: KDE Plasma v: 5.27.12 Distro: Kubuntu 24.04.3 LTS (Noble Numbat)
Machine:
Type: Desktop System: Dell product: Inspiron 3670 v: N/A
serial: <superuser required>
Mobo: Dell model: 0H4VK7 v: A01 serial: <superuser required> UEFI: Dell
v: 2.26.0 date: 11/22/2022
CPU:
Info: 6-core model: Intel Core i7-8700 bits: 64 type: MT MCP cache:
L2: 1.5 MiB
Speed (MHz): avg: 900 min/max: 800/4600 cores: 1: 900 2: 900 3: 900 4: 901
5: 901 6: 900 7: 900 8: 900 9: 900 10: 900 11: 900 12: 900
Graphics:
Device-1: Intel CoffeeLake-S GT2 [UHD Graphics 630] driver: i915 v: kernel
Device-2: NVIDIA GP108 [GeForce GT 1030] driver: nouveau v: kernel
Display: x11 server: X.Org v: 21.1.11 with: Xwayland v: 23.2.6 driver: X:
loaded: modesetting unloaded: fbdev,vesa dri: iris gpu: i915
resolution: 1920x1080~60Hz
API: EGL v: 1.5 drivers: iris,nouveau,swrast
platforms: gbm,x11,surfaceless,device
API: OpenGL v: 4.6 compat-v: 4.3 vendor: intel mesa
v: 25.0.7-0ubuntu0.24.04.2 renderer: Mesa Intel UHD Graphics 630 (CFL GT2)
API: Vulkan v: 1.3.275 drivers: N/A surfaces: xcb,xlib
Audio:
Device-1: Intel Cannon Lake PCH cAVS driver: snd_hda_intel
Device-2: NVIDIA GP108 High Definition Audio driver: snd_hda_intel
Device-3: Logitech Blue Microphones
driver: hid-generic,snd-usb-audio,usbhid type: USB
API: ALSA v: k6.14.0-33-generic status: kernel-api
Server-1: PipeWire v: 1.0.5 status: active
Network:
Device-1: Realtek RTL8111/8168/8211/8411 PCI Express Gigabit Ethernet
driver: r8169
IF: enp2s0 state: up speed: 1000 Mbps duplex: full mac: 8c:ec:4b:79:06:3a
Device-2: Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter
driver: ath9k
IF: wlp3s0 state: down mac: 90:32:4b:7f:d6:ed
Bluetooth:
Device-1: Qualcomm Atheros driver: btusb type: USB
Report: hciconfig ID: hci0 rfk-id: 1 state: down
bt-service: enabled,running rfk-block: hardware: no software: yes
address: 90:32:4B:7F:D6:EE
RAID:
Hardware-1: Intel SATA Controller [RAID mode] driver: ahci
Drives:
Local Storage: total: 931.51 GiB used: 47.11 GiB (5.1%)
ID-1: /dev/sda vendor: Seagate model: ST1000DM010-2EP102 size: 931.51 GiB
Partition:
ID-1: / size: 915.53 GiB used: 47.1 GiB (5.1%) fs: ext4 dev: /dev/sda2
ID-2: /boot/efi size: 299.4 MiB used: 7.8 MiB (2.6%) fs: vfat
dev: /dev/sda1
Swap:
ID-1: swap-1 type: file size: 512 MiB used: 136.4 MiB (26.6%)
file: /swapfile
Sensors:
System Temperatures: cpu: 29.0 C pch: 50.0 C mobo: 28.0 C gpu: nouveau
temp: 32.0 C
Fan Speeds (rpm): fan-1: 1023
Info:
Memory: total: 12 GiB available: 11.51 GiB used: 7.61 GiB (66.1%)
Processes: 332 Uptime: 22h 9m Shell: Bash inxi: 3.3.34