diff --git a/inb4404.py b/inb4404.py
index 6d60325..28e9e7f 100755
--- a/inb4404.py
+++ b/inb4404.py
@@ -1,7 +1,7 @@
 #!/usr/bin/python3
 import urllib.request, urllib.error, urllib.parse, argparse, logging
 import os, re, time
-import http.client 
+import http.client
 import fileinput
 from multiprocessing import Process
 
@@ -18,13 +18,17 @@ def main():
     parser.add_argument('-l', '--less', action='store_true', help='show less information (surpresses checking messages)')
     parser.add_argument('-n', '--use-names', action='store_true', help='use thread names instead of the thread ids (...4chan.org/board/thread/thread-id/thread-name)')
     parser.add_argument('-r', '--reload', action='store_true', help='reload the queue file every 5 minutes')
+    parser.add_argument('-s', '--sleep', action='store', help='sleep `N` seconds between every download', metavar='N') # TODO
     parser.add_argument('-t', '--title', action='store_true', help='save original filenames')
+
+    parser.add_argument('--single-process', action='store_true', help='disable multiprocessing, download one thread at a time')
+
     args = parser.parse_args()
 
     if args.date:
         logging.basicConfig(level=logging.INFO, format='[%(asctime)s] %(message)s', datefmt='%Y-%m-%d %I:%M:%S %p')
     else:
-        logging.basicConfig(level=logging.INFO, format='[%(asctime)s] %(message)s', datefmt='%I:%M:%S %p')    
+        logging.basicConfig(level=logging.INFO, format='[%(asctime)s] %(message)s', datefmt='%I:%M:%S %p')
 
     thread = args.thread[0].strip()
     if thread[:4].lower() == 'http':
@@ -73,7 +77,7 @@ def download_thread(thread_link, args):
     if len(thread_link.split('/')) > 6:
         thread_tmp = thread_link.split('/')[6].split('#')[0]
 
-        if args.use_names or os.path.exists(os.path.join(workpath, 'downloads', board, thread_tmp)):                
+        if args.use_names or os.path.exists(os.path.join(workpath, 'downloads', board, thread_tmp)):
             thread = thread_tmp
 
     while True:
@@ -128,7 +132,7 @@ def download_thread(thread_link, args):
         except urllib.error.HTTPError:
             time.sleep(10)
             try:
-                load(thread_link)    
+                load(thread_link)
             except urllib.error.HTTPError:
                 log.info('%s 404\'d', thread_link)
                 break
@@ -141,22 +145,34 @@ def download_thread(thread_link, args):
             log.info('Checking ' + board + '/' + thread)
         time.sleep(20)
 
+def run_single_process(links_list):
+    for l in links_list:
+        download_thread(l, args)
+
+def run_multiple_process(links_list, processes_list):
+    for l in links_list:
+        process = Process(target=call_download_thread, args=(l, args, ))
+        process.start()
+        processes_list.append([process, l])
+
 def download_from_file(filename):
     running_links = []
     while True:
         processes = []
-        for link in [_f for _f in [line.strip() for line in open(filename) if line[:4] == 'http'] if _f]:
+        for link in [line.strip() for line in open(filename) if line[:4] == 'http']:
             if link not in running_links:
                 running_links.append(link)
                 log.info('Added ' + link)
 
-            process = Process(target=call_download_thread, args=(link, args, ))
-            process.start()
-            processes.append([process, link])
+        if len(running_links) == 0:
+            log.fatal('`%s` is empty!' % filename)
+            return
+
+        if args.single_process:
+            run_single_process(running_links)
+        else:
+            run_multiple_process(running_links, processes)
 
-        if len(processes) == 0:
-            log.warning(filename + ' empty')
-        
         if args.reload:
             time.sleep(60 * 5) # 5 minutes
             links_to_remove = []
@@ -182,4 +198,3 @@ def download_from_file(filename):
         main()
     except KeyboardInterrupt:
         pass
-