Workarounds would be to use the Foliage Paint tool as often as possible to avoid populating your entire scene with Grasses from the landscape grass tool. Secondly, if you do use the landscape grass tool I would look at reducing the cull distances and making sure you have established LODs to handle transitions. Try also reducing the density for the grass tool a bit as sometimes you can a convincing look with half the amount of foliage.
Aside from that, you will need to wait for the release we have it marked to be fixed. Thanks for your patience.
H