Sync Fx v4 mainly supports Silverlight, Windows Phone 7 and other devices. It still uses Sync Fx v2.1 under the hood. unfortunately, they delayed the release and then released part of the CTP as sample code.
I'm not sure which providers you used with v2, but release 2.1 includes bulk procedures using TVP, and this, combined with the use of DatasetSurrogate, improves memory usage and performance compared to previous versions.
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