I suggest that the OP's slow Internet download speeds have nothing to do with either flash storage or a wireless network and everything to do with his having noticed his slow download speeds on a Saturday.
Last night, Sunday, I checked my download speeds from Cox Communications' high speed Internet service and my speed was only about 8 Mbps. I realized, though, that download speeds via a cable high speed Internet service are characteristically
much slower during the weekend than they are during the week. The reason is that the cable company puts a number of its customers' on each node and the more of them who are active on a given node at once, the slower each customer's download speed will be. This morning, Monday, I confirmed this by running my go to
Internet speed test from Speedmatters.org, the same utility I used last night, and my download speed jumped up to 21 Mbps.
If you are experiencing slow download speeds, it is unlikely that even your 802.11g wireless network is the culprit. Theoretically, an 802.11g network is capable of speeds up to 54 Mbps. Typically, such networks will download data at between 24 and 36 Mbps. Thus, if you are worried about Internet download speeds that seem too slow, it is unlikely that even an 802.11g wireless network has detrimentally affected them. Of course, an 802.11n wireless network is even faster than that.