diff --git a/README.md b/README.md
index cc9b4d6..a452fd4 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,8 @@
 * Scans with RecursiveDirectoryIterator
 * Uses native macOS methods and CLI tools
 * Caches assets for re-scans
-* Identifies the most useful information about a file
+* Somewhat multithreaded
+* Aggregates and summarizes metadata
 * Tested with large filesystems
 
 ## Screenshots
diff --git a/Yuba.php b/Yuba.php
index fca538f..8bf44e5 100755
--- a/Yuba.php
+++ b/Yuba.php
@@ -7,7 +7,6 @@ $version = file_get_contents(__DIR__."/version.txt");
 
 ini_set('memory_limit', '10240M');
 date_default_timezone_set("America/Los_Angeles");
-$mytime = time();
 
 // Includes & Prefs
 //////////////////////////////////////////
@@ -24,9 +23,12 @@ $p = unserialize(file_get_contents($prefs_file));
 require("functions.php");
 require("filetypes.php");
 
-$wopt_steps = 12;
+// Manual prefs
+
+$wopt_steps = 12; // total number of steps
 $wopt_currstep = 1;
-$wopt_clear = 0;
+$wopt_clear = 0; // set to 0 for debug
+$wopt_parallel = 1; // use parallel?
 
 $parser = new plistParser();
 
@@ -60,7 +62,11 @@ if (@$argv[1] == "Check for Updates...") {
 // Path & application variables
 //////////////////////////////////////////
 
-$stamp = date("Y-m-d_H-i-s", time());
+$mytime = time();
+$tmpdir = "/tmp/yuba/".$mytime;
+if (!is_dir($tmpdir)) { mkdir($tmpdir,0777,true); }
+
+$stamp = date("Y-m-d_H-i-s", $mytime);
 
 if (!isset($argv[1])) { echo "No input"; die; }
 $zpath = realpath(@$argv[1]);
@@ -560,148 +566,45 @@ foreach ($fx as $array) {
 	}
 echo ProgressBar::finish($wopt_clear);
 
-// Thumbnails
+// Thumbs
 //////////////////////////////////////////
 
 if ($p['thumbs']) {
 
-	echo ProgressBar::start(count($fx),"Generating thumbnails (".stepString().")");
+	echo ProgressBar::start($passed_file,"Creating thumb batch (".stepString().")",1);
+
+	$batchfile = $tmpdir."/_batch_thumbs.sh";
+	$helper = realpath("helper.php");
 	
-	foreach ($fx as $array) {
-		
+	foreach ($fx as $count => $array) {
 		$fid = $array[0];
 		$pathname = $array[1];
-		$ext = pathinfo($pathname,PATHINFO_EXTENSION);
-		$tpath = $bpath."/thumbs/".substr($fid, 0, 2);
-		if (!is_dir($tpath)) { mkdir($tpath); }
-		
-		//$tfile = $tpath."/".$fid."_".$p['thumb_size'].".jpg";
-		//$tpfile = $tpath."/".$fid."_".$p['thumb_size'].".png";
-		
-		$tfile = $tpath."/".$fid.".jpg";
-		$tpfile = $tpath."/".$fid.".png";
-		
-		if (count($p['t_skip']) && in_array($ext, $p['t_skip'])) {
-			echo ProgressBar::next("Skipping ".shortlabel($pathname));
-			continue;
-			}
-		
-		// check for rebuild mode
-		if ($p['thumbs'] == 2) {
-			$update_rowid = $dbp->query("SELECT rowid FROM thumbs WHERE fid='".$fid."'")->fetch()[0];
-			} else {
-			if (is_file($tfile) | is_file($tpfile)) {
-				// faster to check for a file first
-				echo ProgressBar::next("Thumb file found for ".shortlabel($pathname));
-				continue;
-				} elseif ($dbp->query("SELECT EXISTS(SELECT 1 FROM thumbs WHERE fid='".$fid."')")->fetch()[0]) {
-				// if no thumb file, then poll database for prior attempt
-				echo ProgressBar::next("Thumb record found for ".shortlabel($pathname));
-				continue;
-				} else {
-				$update_rowid = false;
-				}
-			}
-		
-		if ($update_rowid) {
-			echo ProgressBar::next("Updating thumb for ".shortlabel($pathname));
-			$stmt = $dbp->prepare("UPDATE thumbs SET fid = :fid, created = :created, relative_path = :relative_path, width = :width, height = :height, tool = :tool WHERE rowid = ".$update_rowid);
-			} else {
-			echo ProgressBar::next("Generating thumb for ".shortlabel($pathname));
-			$stmt = $dbp->prepare("INSERT INTO thumbs VALUES (:fid, :created, :relative_path, :width, :height, :tool)");
-			}
-		
-		$shellpath = escapeshellarg($pathname);
-		$tmp_path = escapeshellarg("/tmp/".basename($pathname).".png"); // qlmanage workaround
-		
-		$fmt['sips'] = $tfile;
-		$fmt['sox'] = $tpfile;
-		$fmt['ffmpeg'] = $tfile;
-		$fmt['ql-thumbnail'] = $tfile;
-		$fmt['qltool'] = $tpfile;
-		$fmt['qlmanage'] = $tpfile;
-		$fmt['vips'] = $tfile;
-		
-		$cmd['sox'] = $bin_sox." ".$shellpath." -n trim 0 $(".$bin_exiftool." -s -s -s -duration# ".$shellpath." | awk '{print $1/10}') spectrogram -o - | ".$bin_convert." - -crop 800x515+58+30 -scale 515x515! +dither -colors 16 ".$tpfile;
-		$cmd['sips'] = "sips -s format jpeg -s formatOptions 80 --resampleHeightWidthMax ".$p['thumb_size']." ".$shellpath." --out ".$tfile;
-		$cmd['ffmpeg'] = $bin_ffmpeg." -ss $(( $(".$bin_mediainfo." --Inform='Video;%Duration%' ".$shellpath." | cut -d'.' -f1) / 10000 )) -i ".$shellpath." -vframes 1 -filter:v scale='400:-1' -q:v 3 ".$tfile;
-		$cmd['ql-thumbnail'] = $bin_qlthumb." ".$shellpath." ".$tfile." public.jpeg ".$p['thumb_size']." ".$p['thumb_size']." .8";
-		//$cmd['qltool'] = $bin_qltool." di ".$shellpath." ".$p['thumb_size']." ".$p['thumb_size']." | base64 --decode | ".$bin_convert." - -scale 50% -strip -trim +repage -define png:compression-level=9 ".$tpfile;
-		$cmd['qltool'] = $bin_qltool." di ".$shellpath." ".$p['thumb_size']." ".$p['thumb_size']." | base64 --decode | ".$bin_convert." - -scale 50% -strip -define png:compression-level=9 ".$tpfile;
-		// qltool thumbs are double size with half the pixels
-		// repage crops thumbs to edge (match sips/ffmpeg thumbs)
-		$cmd['qlmanage'] = "qlmanage -t -f ".floor($p['thumb_size']/128)." -o /tmp/ ".$shellpath."; mv ".$tmp_path." ".$tpfile;
-		$cmd['vips'] = $bin_vips." ".$shellpath." -o ".$tfile."[Q=90,optimize_coding] --size=".$p['thumb_size'];
-		
-		if (in_array($ext, $p['t_files']['sips'])) {
-			$external_tool = "sips";
-			} elseif (in_array($ext, $p['t_files']['ffmpeg'])) {
-			$external_tool = "ffmpeg";
-			} elseif (in_array($ext, $p['t_files']['sox'])) {
-			$external_tool = "sox";
-			} else {
-			$external_tool = null;
-			}
-
-		// using ql-tool or qlmanage may generate blank media icons
-		switch ($p['thumb_priority']) {
-			case 0:
-				// external tool priority
-				$priority = array($external_tool,"ql-thumbnail");
-				break;
-			case 1:
-				// ql-thumbnail priority
-				$priority = array("ql-thumbnail",$external_tool,"qltool","qlmanage");
-				break;
-			case 2:
-				// qltool priority
-				$priority = array("qltool","qlmanage","ql-thumbnail",$external_tool);
-				break;
-			case 3:
-				// qlmanage priority
-				$priority = array("qlmanage","qltool","ql-thumbnail",$external_tool);
-				break;
-			}
-		
-		$stmt->BindValue(":fid",$fid);
-		$stmt->BindValue(":created",time());
-		// store the attempt in the DB so we don't try to generate thumbs for the same fid multiple times
-		
-		foreach ($priority as $tool) {
-			if (@$cmd[$tool]) {
-				$stmt->BindValue(":tool",$tool);
-				shell_exec($cmd[$tool]." 2>&1");
-				msg($cmd[$tool]);
-				if (is_file($fmt[$tool]) && @filesize($fmt[$tool])) {
-					$stmt->BindValue(":relative_path",substr($fmt[$tool], strlen($bpath)));
-					list($width, $height) = getimagesize($fmt[$tool]);
-					$stmt->BindValue(":width",$width);
-					$stmt->BindValue(":height",$height);
-					break;
-					}
-				}
-			}
-		
-		$stmt->execute();
-	
+		$tcmd = $bin_php." ".$helper." thumbs ".$fid." ".escapeshellarg($pathname)." ".escapeshellarg($bpath)." ".$mytime."; echo ".ProgressBar::next();
+		msg($tcmd);
+		$line[] = $tcmd;
 		}
-	
+		
+	file_put_contents($batchfile,implode("\n", $line));
 	echo ProgressBar::finish($wopt_clear);
-
+	
+	echo ProgressBar::start($passed_file,"Running thumb batch (".stepString().")");	
+	if ($wopt_parallel) {
+		passthru($bin_parallel." < ".$batchfile);
+		} else {
+		passthru("bash ".$batchfile);
+		}
+	echo ProgressBar::finish($wopt_clear);
+	
 	}
 
 // Icons
 //////////////////////////////////////////
 
-$p['icons'] = 1;
-
 if ($p['icons']) {
 
 	echo ProgressBar::start($passed_file,"Creating icon batch (".stepString().")",1);
 
-	if (!is_dir("/tmp/Yuba/")) { mkdir("/tmp/Yuba/"); }
-	if (!is_dir("/tmp/Yuba/".$mytime)) { mkdir("/tmp/Yuba/".$mytime); }
-	$batchfile = "/tmp/Yuba/".$mytime."/_batch_icons.sh";
+	$batchfile = $tmpdir."/_batch_icons.sh";
 	$helper = realpath("helper.php");
 	
 	foreach ($fx as $count => $array) {
@@ -711,14 +614,16 @@ if ($p['icons']) {
 		msg($icmd);
 		$line[] = $icmd;
 		}
+		
 	file_put_contents($batchfile,implode("\n", $line));
-	
 	echo ProgressBar::finish($wopt_clear);
 	
-	echo ProgressBar::start($passed_file,"Running icon batch (".stepString().")");
-	
-	passthru($bin_parallel." < ".$batchfile);
-	
+	echo ProgressBar::start($passed_file,"Running icon batch (".stepString().")");	
+		if ($wopt_parallel) {
+		passthru($bin_parallel." < ".$batchfile);
+		} else {
+		passthru("bash ".$batchfile);
+		}
 	echo ProgressBar::finish($wopt_clear);
 	
 	}
diff --git a/version.txt b/version.txt
index fabfd2d..ef2481a 100755
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-0.7.12.6
\ No newline at end of file
+0.7.12.7
\ No newline at end of file