my notebook is not much better and gwx runs well. i replaced the gwx-textures for the crew with the sh3-stock ones. otherwise it was unplayable when some bernard appeared on the screen. after that replacement it was running really got, got no problems now.
i would suggest to install gwx and if necessary replace new high quality textures with the original ones. start with the crew, maybe also replace the instruments, but they are not that big i think.
have fun, its really worth to install
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