Not so much a flaw; the HP Stream usually has an underpowered CPU, and often not enough Memory to run W10!
Lots of those netbooks have an Intel Atom CPU processor, which I happen to have on my 8 year old Acer AspireOne Netbook. It's not endemic to HP brand, but all major netbook brands suffer from this. Also, it came with 1GB RAM; which I upgraded to 2GB after it was gifted to me by a Customer, who has several newer laptops and didn't use that one anymore. It has the Atom Processor; and W10 has always been slow on it.
Remember, 2GB RAM is minimum requirement for W10, but that doesn't mean you get good performance from any computer or laptop running W10.
You really need 4GB RAM!!
Additionally, if your HP Stream, has a Centrino Pentium CPU or even a Centrino-Mobile Dual-Core CPU; that's still way underpowered for W10 in most cases.
1.) To help you further, you need to tell us how much RAM is in your HP Stream.
2.) Next, exactly what CPU processor chip does it have?
Those 2 things are most likely causing your lagging problem. If you can't find this information, and you don't have it written down or are not familiar with how to check that in windows; visit
Link Removed and download the Free
SPECCY diagnostic program. Install and run on your HP netbook, and post back the resulting output text file back to this thread where we can examine it and find out exactly what your hardware specs are. Most likely, that Stream is too underpowered to properly run W10.
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