Chromium works with those parameters on armhf and arm64. Cache = /tmp (memory), size = /tmp size.

config/chromium.conf

@@ -6,7 +6,11 @@ CHROMIUM_FLAGS="\
 --disable-smooth-scrolling \
 --disable-low-res-tiling \
 --enable-low-end-device-mode \
---num-raster-threads=4 \
+--num-raster-threads=$(grep -c processor /proc/cpuinfo) \
 --profiler-timing=0 \
 --disable-composited-antialiasing \
---disk-cache-size=300000000
+--disk-cache-dir=/tmp/cache \
+--disk-cache-size=$(df -B1 /tmp --output=source,avail | tail -1 | awk '{print $2}') \
+--no-sandbox \
+--test-type \
+"

desktop.sh

@@ -22,10 +22,8 @@ install_desktop ()
 	if [[ $RELEASE == xenial ]]; then
 		# install optimized firefox configuration
 		# cp $SRC/lib/config/firefox.conf $CACHEDIR/$SDCARD/etc/firefox/syspref.js
-
 		# install optimized chromium configuration
 		cp $SRC/lib/config/chromium.conf $CACHEDIR/$SDCARD/etc/chromium-browser/default
-		echo "export XDG_CACHE_HOME=\"/var/log/.cache\"" > $CACHEDIR/$SDCARD/etc/chromium-browser/customizations/10-cachedir
 	fi
 	# install dedicated startup icons
 	cp $SRC/lib/bin/icons/${RELEASE}.png $CACHEDIR/$SDCARD/usr/share/pixmaps

scripts/armhwinfo

@@ -312,41 +312,11 @@ check_sd_card_speed() {
 	fi
 } # check_sd_card_speed
 
-adjust_chromium_settings() {
-	if [ -f /etc/chromium-browser/default ]; then
-
-		# create chromium cache directory
-		[[ ! -d /var/log/.cache ]] && mkdir /var/log/.cache && chgrp netdev /var/log/.cache && chmod g+w /var/log/.cache
-
-		# Desktop image. Let's adjust chromium cache size depending on available DRAM (15%)
-		# and count of render threads based on number of CPU cores
-		mem_info=$(LANG=en_US.UTF-8 free -w 2>/dev/null | grep "^Mem" || LANG=en_US.UTF-8 free | grep "^Mem")
-		memory_total=$(awk '{printf("%d",$2/1024)}' <<<${mem_info})
-		cpu_cores=$(grep -c processor /proc/cpuinfo)
-		chromium_disk_cache=$(( ${memory_total} * 158000 ))
-		log2ram_size=$(( 50 + $(( ${memory_total} / 1000 * 150 )) ))
-
-		# adjust log2ram config if necessary (switching between devices with different amount
-		# of DRAM but same OS image)
-		grep -q "^SIZE=${log2ram_size}M" /etc/default/log2ram || \
-			sed -i "s/^SIZE=.*/SIZE=${log2ram_size}M/" /etc/default/log2ram && \
-			systemctl restart log2ram
-
-		# adjust chromium settings
-		sed -i -e "s/disk-cache-size=.*/disk-cache-size=${chromium_disk_cache}/" \
-			-e "s/num-raster-threads=.*/num-raster-threads=${cpu_cores}/" \
-			/etc/chromium-browser/default
-	fi
-} # adjust_chromium_settings
-
 case $1 in
 	*start*)
 		# set optimal disk scheduler settings
 		set_io_scheduler &
 
-		# check/set chromium optimizations
-		adjust_chromium_settings &
-
 		# check sd card speed once on 3rd boot too warn for too slow media
 		check_sd_card_speed &