[Nexus 6  General] fedef12evo:
Hello I found this flashable tweak from franco dev team, 2013 , but they are working good just sharing then. Credits to the awesome franco and his dev team.

Just flash it in recovery, to remove them just dirty flash your current ROM, enjoy.

875mntsettings

#!/system/bin/sh
# chmod -R 755 /system/etc/init.d
# 12-May-2013 by Franco's Dev Team
# malaroth, osm0sis, joaquinf, The Gingerbread Man, pkgnex, Khrushy, shreddintyres

# sysfs+sdcard tweaks
busybox mount -o remount,nosuid,nodev,noatime,nodiratime -t auto /;
busybox mount -o remount,nosuid,nodev,noatime,nodiratime -t auto /proc;
busybox mount -o remount,nosuid,nodev,noatime,nodiratime -t auto /sys;
busybox mount -o remount,nosuid,nodev,noatime,nodiratime -t auto /sys/kernel/debug;
busybox mount -o remount,nosuid,nodev,noatime,nodiratime -t auto /mnt/shell/emulated;
for i in /storage/emulated/*; do
busybox mount -o remount,nosuid,nodev,noatime,nodiratime -t auto $i;
busybox mount -o remount,nosuid,nodev,noatime,nodiratime -t auto $i/Android/obb;
done;

# partition tweaks
busybox mount -o remount,nosuid,nodev,noatime,nodiratime,barrier=0,noauto_da_alloc,discard -t auto /data;
busybox mount -o remount,nosuid,nodev,noatime,nodiratime,barrier=0,noauto_da_alloc,discard -t auto /cache;
busybox mount -o remount,nodev,noatime,nodiratime,barrier=0,noauto_da_alloc,discard -t auto /system;

925vmsettings

#!/system/bin/sh
# chmod -R 755 /system/etc/init.d
# 26-Jun-2013 by Franco's Dev Team
# malaroth, osm0sis, joaquinf, The Gingerbread Man, pkgnex, Khrushy, shreddintyres

# disable sysctl.conf to prevent ROM interference
if [ -e /system/etc/sysctl.conf ]; then
mount -o remount,rw /system;
mv /system/etc/sysctl.conf /system/etc/sysctl.conf.fkbak;
mount -o remount,ro /system;
fi;

# vm tweaks
echo 5 > /proc/sys/vm/dirty_background_ratio;
echo 200 > /proc/sys/vm/dirty_expire_centisecs;
echo 20 > /proc/sys/vm/dirty_ratio;
echo 500 > /proc/sys/vm/dirty_writeback_centisecs;
echo 2884 > /proc/sys/vm/min_free_kbytes;
echo 4 > /proc/sys/vm/min_free_order_shift;
echo 3 > /proc/sys/vm/page-cluster;
echo 0 > /proc/sys/vm/swappiness;
echo 100 > /proc/sys/vm/vfs_cache_pressure;

# lmk tweaks
minfree=6144,8192,12288,16384,24576,40960;
lmk=/sys/module/lowmemorykiller/parameters/minfree;
minboot=`cat $lmk`;
while sleep 1; do
if [ `cat $lmk` != $minboot ]; then
[ `cat $lmk` != $minfree ] && echo $minfree > $lmk || exit;
fi;
done&

# fs tweaks
echo 10 > /proc/sys/fs/lease-break-time;

# entropy tweaks
echo 128 > /proc/sys/kernel/random/read_wakeup_threshold;
echo 256 > /proc/sys/kernel/random/write_wakeup_threshold;

# tcp tweaks
echo "westwood" > /proc/sys/net/ipv4/tcp_congestion_control;

950iosettings

#!/system/bin/sh
# chmod -R 755 /system/etc/init.d
# 11-Jun-2013 by Franco's Dev Team
# malaroth, osm0sis, joaquinf, The Gingerbread Man, pkgnex, Khrushy, shreddintyres

# disable sysctl.conf to prevent ROM interference
if [ -e /system/etc/sysctl.conf ]; then
mount -o remount,rw /system;
mv /system/etc/sysctl.conf /system/etc/sysctl.conf.fkbak;
mount -o remount,ro /system;
fi;

# general queue tweaks
for i in /sys/block/*/queue; do
echo 512 > $i/nr_requests;
echo 512 > $i/read_ahead_kb;
echo 2 > $i/rq_affinity;
echo 0 > $i/nomerges;
echo 0 > $i/add_random;
echo 0 > $i/rotational;
done;

# override scheduler defaults with tweaked values
scheduler=reset;
while sleep 1; do
current=`cut -d\[ -f2 /sys/block/mmcblk0/queue/scheduler | cut -d\] -f1`;
if [ $scheduler != $current ]; then
scheduler=$current;
if [ $scheduler == "deadline" ]; then

# deadline tweaks
echo 250 > /sys/block/mmcblk0/queue/iosched/read_expire;
echo 2500 > /sys/block/mmcblk0/queue/iosched/write_expire;
echo 1 > /sys/block/mmcblk0/queue/iosched/writes_starved;
echo 1 > /sys/block/mmcblk0/queue/iosched/front_merges;
echo 8 > /sys/block/mmcblk0/queue/iosched/fifo_batch;

elif [ $scheduler == "row" ]; then

# row tweaks
echo 100 > /sys/block/mmcblk0/queue/iosched/hp_read_quantum;
echo 75 > /sys/block/mmcblk0/queue/iosched/rp_read_quantum;
echo 5 > /sys/block/mmcblk0/queue/iosched/hp_swrite_quantum;
echo 4 > /sys/block/mmcblk0/queue/iosched/rp_swrite_quantum;
echo 4 > /sys/block/mmcblk0/queue/iosched/rp_write_quantum;
echo 3 > /sys/block/mmcblk0/queue/iosched/lp_read_quantum;
echo 12 > /sys/block/mmcblk0/queue/iosched/lp_swrite_quantum;
echo 10 > /sys/block/mmcblk0/queue/iosched/read_idle;
echo 25 > /sys/block/mmcblk0/queue/iosched/read_idle_freq;
## N4 and N10 row adds lsl and rsl, which were hardcoded previously
echo 10000 > /sys/block/mmcblk0/queue/iosched/low_starv_limit;
echo 5000 > /sys/block/mmcblk0/queue/iosched/reg_starv_limit;
## N4 and N10 have a new version of row with corrected entry for lsq and renamed ri and rif
[ `cat /sys/block/mmcblk0/queue/iosched/lp_swrite_quantum` != "2" ] && echo 2 > /sys/block/mmcblk0/queue/iosched/lp_swrite_quantum;
echo 10 > /sys/block/mmcblk0/queue/iosched/rd_idle_data;
echo 25 > /sys/block/mmcblk0/queue/iosched/rd_idle_data_freq;

elif [ $scheduler == "cfq" ]; then

# cfq tweaks
echo 4 > /sys/block/mmcblk0/queue/iosched/quantum;
echo 80 > /sys/block/mmcblk0/queue/iosched/fifo_expire_sync;
echo 330 > /sys/block/mmcblk0/queue/iosched/fifo_expire_async;
echo 12582912 > /sys/block/mmcblk0/queue/iosched/back_seek_max;
echo 1 > /sys/block/mmcblk0/queue/iosched/back_seek_penalty;
echo 60 > /sys/block/mmcblk0/queue/iosched/slice_sync;
echo 50 > /sys/block/mmcblk0/queue/iosched/slice_async;
echo 2 > /sys/block/mmcblk0/queue/iosched/slice_async_rq;
echo 0 > /sys/block/mmcblk0/queue/iosched/slice_idle;
echo 0 > /sys/block/mmcblk0/queue/iosched/group_idle;
echo 1 > /sys/block/mmcblk0/queue/iosched/low_latency;
## N4 and N10 cfq adds tl, which was hardcoded previously
echo 300 > /sys/block/mmcblk0/queue/iosched/target_latency;

fi;
fi;
# loop forever independently
done&