[Q] tweaking script for Tablet: gets slow after a while - Android Q&A, Help & Troubleshooting

Hi.
There is a script for my (future) tablet out there, it is supposed to make the tablet work smoother.
Unfortunately there are reports that the tablet gets very slow after a longer time without reboot.
Can anybody look over the script and tell me what the problem could be?
Tablet is a Hannspree Hannspad, rather similar to Advent Vega.
Thanks in Advance
Script in /system/etc/:
#!/bin/bash
# Tweaks for Hannspad v0.23
# by Archimed
# Tweaks RAM"
echo 1536,3072,5632,6144,7168,8192 > /sys/module/lowmemorykiller/parameters/minfree;
echo 0,3,5,7,14,15 > /sys/module/lowmemorykiller/parameters/adj;
echo 0 > /sys/module/lowmemorykiller/parameters/debug_level;
echo 64 > /sys/module/lowmemorykiller/parameters/cost;
#Sdcache speedup sd read
echo 4096 > /sys/devices/virtual/bdi/179:16/read_ahead_kb;
echo 4096 > /sys/devices/virtual/bdi/179:24/read_ahead_kb;
echo 0 > /proc/sys/vm/swappiness;
#gives more mem to cache fs dentry and inode to save cpu
echo 10 > /proc/sys/vm/vfs_cache_pressure;
echo 65 > /proc/sys/vm/dirty_ratio;
echo 10 > /proc/sys/vm/dirty_background_ratio;
#echo 20480 > /proc/sys/vm/min_free_kbytes;
#page-cluster controls the number of pages which are written to swap in a single attempt
echo 0 > /proc/sys/vm/page-cluster;
echo 15 >/proc/sys/fs/lease-break-time;
#specifies the grace period (in seconds) that the kernel grants to a process holding a file lease after it has sent a signal to that process notifying it that another process is waiting to open the file
echo 10000000 > /proc/sys/kernel/sched_latency_ns;
echo 2000000 > /proc/sys/kernel/sched_min_granularity_ns;
echo 760000 > /proc/sys/kernel/sched_wakeup_granularity_ns;
echo 0 > /proc/sys/vm/oom_kill_allocating_task;
#TCP tweak
echo 0 > /proc/sys/net/ipv4/tcp_timestamps;
echo 1 > /proc/sys/net/ipv4/tcp_tw_reuse;
echo 1 > /proc/sys/net/ipv4/tcp_sack;
echo 1 > /proc/sys/net/ipv4/tcp_tw_recycle;
echo 1 > /proc/sys/net/ipv4/tcp_window_scaling;
echo 5 > /proc/sys/net/ipv4/tcp_keepalive_probes;
echo 30 > /proc/sys/net/ipv4/tcp_keepalive_intvl;
echo 25 > /proc/sys/net/ipv4/tcp_fin_timeout;
echo 404480 > /proc/sys/net/core/wmem_max;
echo 404480 > /proc/sys/net/core/rmem_max;
echo 256960 > /proc/sys/net/core/rmem_default;
echo 256960 > /proc/sys/net/core/wmem_default;
echo 4096 16384 404480 > /proc/sys/net/ipv4/tcp_wmem;
echo 4096 87380 404480 > /proc/sys/net/ipv4/tcp_rmem;
setprop wifi.supplicant_scan_interval 400;
#better scrolling speed through lists
setprop windowsmgr.max_events_per_sec 65;
## disable touch below 60 pixels
#setprop mot.proximity.delay 60;
# NEVER kill the launcher, speedup Home return but less free memory
echo -17 > /proc/`pidof com.android.launcher`/oom_adj;
#remounting file systems with noatime nodiratime flags ,save battery and CPU
for x in $(busybox mount | cut -d " " -f3);
do
if [ "$x" != "/acct" ] && [ "$x" != "/dev/cpuctl" ]; then
sync;
log -p i -t remount_volume "remount $x noatime nodiratime";
busybox mount -o remount,noatime,nodiratime $x;
fi
done;
#flags every mounted partition as non rotational and increases it's cache size for more read speed
array=("/sys/block/mtdblock3" "/sys/block/mtdblock7" "/sys/block/mmcblk3" "/sys/block/mtdblock4" "/sys/block/mtdblock0" );
len=${#array[*]};
i=0;
while [ $i -lt $len ];
do
rep=${array[$i]};
echo 0 > $rep/queue/rotational;
echo 4096 > $rep/queue/read_ahead_kb;
echo 512 > $rep/queue/nr_requests;
echo 1 > $rep/queue/iosched/low_latency;
let i++;
done;
# Switch CPU frequency to lowest in sleep mode
CUR_MAX_CPU=`cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq`;
(while [ 1 ];
do
AWAKE=`cat /sys/power/wait_for_fb_wake`;
if [ $AWAKE = "awake" ]; then
echo $CUR_MAX_CPU > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq;
echo 216000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq;
echo 5000 > /proc/sys/vm/dirty_expire_centisecs;
echo 1500 > /proc/sys/vm/dirty_writeback_centisecs;
log -p i -t Screenstate "script.sh AWAKE -> switching max CPU frequency $CUR_MAX_CPU hz";
fi
SLEEP=`cat /sys/power/wait_for_fb_sleep`;
CUR_MAX_CPU=`cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq`;
if [ $SLEEP = "sleeping" ]; then
echo 216000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq;
echo 216000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq;
log -p i -t Screenstate "script.sh SLEEP -> switching max CPU frequency 216 Mhz";
echo 40000 > /proc/sys/vm/dirty_expire_centisecs;
echo 60000 > /proc/sys/vm/dirty_writeback_centisecs;
#free pagecache, dentries and inodes:
echo 3 > /proc/sys/vm/drop_caches
#kill some process who use to much cpu in sleep
newsrepublic=`pidof com.mobilesrepublic.appytablet`;
mxvideoplayer=`pidof com.mxtech.videoplayer.ad`;
googlemaps=`pidof com.google.android.apps.maps`;
gapps=`pidof com.google.process.gapps`;
gallery=`pidof com.android.gallery3d`;
voice=`pidof com.google.android.apps.googlevoice`;
googlemaps2=`pidof com.google.android.apps.maps:NetworkLocationServic e`;
gallery2=`pidof com.flikie.wallpapers.gallery`;
kill $newsrepublic $mxvideoplayer $googlemaps $gapps $voice $googlemaps2 $gallery2;
log -p i -t Screenstate "script.sh kill pid $newsrepublic $mxvideoplayer $googlemaps $gapps $voice $googlemaps2 $gallery2";
fi
sleep 2;
done &);
#Battery temperature control
(while [ 1 ];
do
sleep 900;
TEMP=`cat /sys/class/power_supply/battery/temp`;
if [ $TEMP -gt 450 ]; then
log -p i -t BatteryTempState "script.sh battery temperature too high (`expr $TEMP / 10` C) reduce CPU -> 760 Mhz";
echo 760000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq;
echo 216000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq;
if [ $TEMP -gt 500 ]; then
log -p i -t BatteryTempState "script.sh battery temperature is critical (`expr $TEMP / 10` C) Emergency Shutdown";
reboot -p;
fi
else
log -p i -t BatteryTempState "script.sh battery temperature (`expr $TEMP / 10` C)";
fi
done &);
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Nobody, who wants to look over the script?