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To see what needs to be upgraded while you are streaming open task manager and go to the performance tab.
For example here is mine, nothing is maxed out, ignore the fact i have 10+ HDDs.
CPU should never be at 100%.
RAM should never be at 100%.
If one of those 2 are maxed out while streaming and playing games you will lag, ideally you should have a good Ryzen CPU and 32-64GB RAM as a streamer.
GPU running at 100% is normal while gaming.