If do you want to exclude scanning folders and files from Sophos, maybe this link can be helpful.
If this is not what are you looking for, please give us more details.
If you excluded the folders with no luck, maybe the antivirus isn't the problem. For testing purposes, could you disable the antivirus, restart your computer and check if the slowness still remains? If not, can you check your windows firewall as well? You can do the same test than the antivirus (disabling) or try to add a rule to allow all traffic with sourcetree.
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