I'm trying Nodeos, but full-syncing takes too much time. Is there a way to light-sync Nodeos? Such as "syncmode=light" of Geth? Thanks in advance.
Yes, you can run
nodeos --help should provide information about the flags:
Chain validation mode ("full" or "light")
In "full" mode all incoming blocks will be fully validated
In "light" mode all incoming blocks headers will be fully validated; transactions in those validated blocks will be trusted