“When put buffer at 32 cpu meter went to red…”
This is your issue. A newer and more powerful PC won’t do anything to improve your audio buffer response.
Your audio device, when set to 32ms instead of 128ms, will be interrupting your CPU over 400% more often. This adds a lot of extra load as it has to switch between other tasks more often. Having additional devices in your system (hard drives, USB devices, additional PCI-e cards) will add more interrupts on top of this.
Most systems cannot run projects with lots of plugins active with such a small audio buffer size, especially if you’re using a high sampling rate (say, 96kHz). Most studios will be running around 128ms minimum and even up to 1024ms if they are running huge production projects.
I personally use:
256ms with 44.1kHz/48kHz for most production projects
128ms or 256ms with 96kHz for singers (producing acapellas) with hardly any plugins active for low latency
512ms or 1024ms for large production projects where I need to keep on top of audio buffer underruns.
There’s no real need for 32ms as this is imperceptible. If your system can handle it that low, it wouldn’t be recommended to use any plugins, especially software instruments, as this will dramatically add to the ASIO load.