Why does the Xiaomi 15 heat up when using the floating windows of the APPs?

If the Xiaomi 15 heats up when using the floating windows of the APPs, please refer to the following details:
1. Running multiple APPs in floating windows requires the CPU to process multiple tasks at once and the GPU to render multiple APP interfaces, increasing power consumption and heat;
2. Using the floating windows of the APPs involves the simultaneous running of multiple APPs, generating a high power consumption and an obvious temperature rise, which is normal;
3. Running floating windows while charging increases power consumption, which can make the phone heat up even more;
4. Before the phone leaves the factory, the phone has been strictly inspected, please feel free to use it.