Ubuntu kernels 4.2 and 4.4 I/O slowdown with KTorrent on NTFS

[Eugene86]

After upgrading to 4.4.0-22-lowlatency (or 4.2.0-36-generic 4.4.0-22-generic) kernel (from kernel 3.19.0-32-generic) KTorrent downloading to NTFS partition (FUSE) significantly degraded performance and latency.
For instance during the download to NTFS partition (FUSE) KTorrent hanged for seconds, download speed decreased, sometimes up to 400Kbit/s. There is no such issue with 3.19.0-32-generic kernel. But with that old kernel there is other issue (epic bug 12309) , that I've commented on bugzilla.kernel.org: https://bugzilla.kernel.org/show_bug.cgi?id=12309#c640

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-generic-lts-xenial 4.4.0.22.12
ProcVersionSignature: Ubuntu 4.4.0-22.40~14.04.1-lowlatency 4.4.8
Uname: Linux 4.4.0-22-lowlatency x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.20
Architecture: amd64
CurrentDesktop: MATE
Date: Thu May 19 22:27:56 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2016-03-13 (67 days ago)
InstallationMedia: Linux Mint 17.3 "Rosa" - Release amd64 20151128
SourcePackage: linux-meta-lts-xenial
UpgradeStatus: No upgrade log present (probably fresh install)

[Eugene86 (eugene86)]

I've started
# dd if=/dev/zero of=/mnt/win_k/data.dat
gkrellm graph for kernel 3.19 is attached
As you can see there are narrow stripes. On 4.4 stripes are wide

[Eugene86 (eugene86)]

I've started
# dd if=/dev/zero of=/mnt/win_k/data.dat bs=4096
gkrellm graph for kernel 4.4 is attached
As you can see there are wide stripes. On 3.19 stripes are narrow

(block size param bs=4096 in both cases