UPDATE 2 | Fixed input lag and floaty mouse with UPS

[Ali]

fix found guys!!!
all order ups with VFI-SS-111!
Chief, close forum.

Not all double-conversion UPS systems are the same. It's like buying a car: all cars have four wheels and a steering wheel, but that doesn't mean they're all the same. Some double-conversion UPS systems produce very high EMI noise, non-sine-wave AC output, and high-impedance power. A proper double-conversion UPS should provide extremely low conducted EMI noise, a clean sine-wave output, and ultra-low-impedance power. Low output impedance is particularly important because PCs draw power dynamically. For example, a PC might consume 800 watts on average but can also draw around 1,500 watts within milliseconds during sudden power spikes. Therefore, the UPS must be capable of handling these rapid changes in power demand without significant voltage drops. In my opinion, the ideal solution is a double-conversion UPS that uses an ultra-low-impedance LiFePO4 battery combined with a low-frequency inverter. This type of setup can provide clean sine-wave AC power, low EMI noise, and ultra-low output impedance. Low-frequency inverters are particularly interesting because they use transformers and can handle high surge currents. This is the type of high-quality online UPS architecture used in demanding applications such as data centres. However, these systems are not cheap. We can also build our own ultra-low-impedance power source using an ultra-low-impedance LiFePO4 battery and a low-frequency inverter. I'm saving money to build this setup, but both ultra-low-impedance LiFePO4 batteries and low-frequency inverters are quite expensive.

No one said it´s the ultima fix.
Are you sure the "apc smart ups" was online and NOT line?
There exist also line versions on the market.

SMX1000I
that is line interactive
anyway, that all is same, just unplug ups, and if you not feel instantly fix, that is not socet, because in another apartment same pc with same psu work perfectly.