This is the principle of barter. You have to give away your items to take items from the merchant. If the merchant has caps, then you can use it to equalize the amount. If you give away your items without asking for anything in return, the merchant will take it from you for free.
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You can also win caps by gambling with the merchant.
Performance problems arise due to the conflict of the new version of the electron framework with the old drivers for AMD graphics cards. Specifically, the drivers of version
8.17.10.XXXX do not work correctly. If you are installing drivers of a newer or older version, then such a problem should not arise.
As far as I can see, both newer and older driver versions are available for your video card model. Try installing any of these versions except
8.17.10.XXXX.