A lot of things can explain your issue here, but it comes down to two things: your hardware seems insufficient, and you are not being economic in how you use Blender.
As explained on Requirements — blender.org:
- 64-bit quad core CPU with SSE2 support
- 8 GB RAM
- Full HD display
- Mouse, trackpad or pen+tablet
- Graphics card with 2 GB RAM, OpenGL 4.3
- Less than 10 year old
Supported Graphics Cards
Haswell architecture and newer. [list of all Intel
What you have:
An Intel i5 1135G7 CPU with an Iris Xe Graphics graphic chipset. No idea about your RAM memory though.
You seem to at least meet the minimal requirements to be able to run Blender, but not to make a lot of things with it. Not having a dedicated GPU means that a part of your RAM is used for graphics instead of being fully available to your CPU's function. It also is way less powerful than what a simple dedicated GPU could do.
Your CPU itself is probably to be considered a low-mid range, just looking at its median score of 62.72 on Blender Open Data. It's not a power horse.
If you are interested in changing your hardware, this isn't something we can really help with here. However, I encourage you to read this answer for a better understanding of the matter.
Deforming a character in realtime, even a simple one, can be a challenging task for a computer. And considering your hardware, I would be really carefull to not ask Blender to do too many things at the same time.
Yet looking at your screenshot, we can see that:
you have two viewports open at the same time
at least one of them is in material view, which is more complex to display than solid view
it's hard to see with the low resolution, but it looks like your viewport is also anti-aliased?
You should probably go to Edit > Preferences > Viewport and disable these settings:
Do you use the Simplify panel in your rendering settings?