diff --git a/filterwidget.py b/filterwidget.py
index 3952922..2db114b 100644
--- a/filterwidget.py
+++ b/filterwidget.py
@@ -1,13 +1,53 @@
+import multiprocessing
+import os
+import tempfile
+import time
+from typing import Optional
+
+from PyQt6.QtCore import QRunnable, QThread, QThreadPool
 from PyQt6.QtWidgets import QWidget, QVBoxLayout, QHBoxLayout, QLineEdit, QCheckBox
 
 from bigtext import BigText
 from logFileModel import LogFileModel
+import asyncio
 
+class FilterTask(QRunnable):
+
+    aborted = False
+    future : asyncio.Future
+
+    def __init__(self, source_model: LogFileModel, filter_model: LogFileModel, query: str):
+        super(FilterTask, self).__init__()
+        self.source_model = source_model
+        self.filter_model = filter_model
+        self.query = query
+        self.future = asyncio.Future()
+
+    def run(self):
+        #print("writing to tmp file", self.filter_model.get_file())
+        start = time.time()
+        self.filter_model.truncate()
+        with open(self.source_model.get_file(), "rb") as source:
+            while l := source.readline():
+                line = l.decode("utf8", errors="ignore")
+                #print(line)
+                if line.find(self.query) >= 0:
+                    self.filter_model.write_line(line)
+
+                if self.aborted or self.future.cancelled():
+                    print("aborted")
+                    break
+        print("filtering for %s took %s" % (self.query, time.time() - start) )
+        self.future.done()
 
 class FilterWidget(QWidget):
-    def __init__(self, model: LogFileModel):
+    future = None
+    filter_model : LogFileModel
+    filter_task :Optional[FilterTask] = None
+
+    def __init__(self, source_model: LogFileModel):
         super(FilterWidget, self).__init__()
-        self.model = model
+        self.source_model = source_model
 
         self.layout = QVBoxLayout(self)
         self.layout.setContentsMargins(0, 0, 0, 0)
@@ -23,15 +63,33 @@ class FilterWidget(QWidget):
 
         filter_bar = QWidget()
         filter_bar.layout = QHBoxLayout(filter_bar)
-        filter_bar.layout.setContentsMargins(0,0,0,0)
+        filter_bar.layout.setContentsMargins(0, 0, 0, 0)
         filter_bar.layout.addWidget(query_field)
         filter_bar.layout.addWidget(ignore_case)
         filter_bar.layout.addWidget(is_regex)
 
-        self.hits_view = BigText(model)
+        (_handle, self.tmpfilename) = tempfile.mkstemp()
+        self.filter_model = LogFileModel(self.tmpfilename, self.source_model.settings)
+        self.hits_view = BigText(self.filter_model)
 
         self.layout.addWidget(filter_bar)
         self.layout.addWidget(self.hits_view)
 
     def query_changed(self, query: str):
-        print(query)
\ No newline at end of file
+        if len(query) == 0:
+            return
+
+        print("start function")
+        if self.filter_task:
+            print("abort started ", time.time())
+            self.filter_task.aborted = True
+            print("abort done    ", time.time())
+
+        self.filter_task = FilterTask(self.source_model, self.filter_model, query)
+        # QThreadPool takes ownership and deletes 'hello' automatically
+        QThreadPool.globalInstance().start(self.filter_task)
+
+
+
+
+
diff --git a/logFileModel.py b/logFileModel.py
index 7947d99..b3ae4fe 100644
--- a/logFileModel.py
+++ b/logFileModel.py
@@ -74,4 +74,15 @@ class LogFileModel:
             return result
 
     def byte_count(self) -> int:
-        return os.stat(self._file).st_size
\ No newline at end of file
+        return os.stat(self._file).st_size
+
+    def write_line(self, line: str):
+        with open(self._file, 'a+b') as f:
+            f.write(line.encode("utf8"))
+            if not line.endswith("\n"):
+                f.write("\n".encode("utf8"))
+
+    def truncate(self):
+        with open(self._file, 'a') as f:
+            print("truncating")
+            f.truncate(0)
\ No newline at end of file