Optimize for disk cache

Disable delay rendering and change cache size defaults for optimizing
the use of the disk cache

src/calibre/gui2/__init__.py

@@ -113,10 +113,10 @@ defs['extra_row_spacing'] = 0
 defs['refresh_book_list_on_bulk_edit'] = True
 defs['cover_grid_width'] = 0
 defs['cover_grid_height'] = 0
-defs['cover_grid_color'] = (80, 80, 80)
-defs['cover_grid_cache_size'] = 200
-defs['cover_grid_disk_cache_size'] = 2000
 defs['cover_grid_spacing'] = 0
+defs['cover_grid_color'] = (80, 80, 80)
+defs['cover_grid_cache_size'] = 100
+defs['cover_grid_disk_cache_size'] = 2500
 defs['cover_grid_show_title'] = False
 del defs
 # }}}

src/calibre/gui2/library/alternate_views.py

@@ -438,6 +438,7 @@ class GridView(QListView):
 
     update_item = pyqtSignal(object)
     files_dropped = pyqtSignal(object)
+    delay_render = False
 
     def __init__(self, parent):
         QListView.__init__(self, parent)
@@ -466,6 +467,7 @@ class GridView(QListView):
         self.setCursor(Qt.PointingHandCursor)
         self.gui = parent
         self.context_menu = None
+        if self.delay_render:
             self.verticalScrollBar().sliderPressed.connect(self.slider_pressed)
             self.verticalScrollBar().sliderReleased.connect(self.slider_released)
         self.update_timer = QTimer(self)
@@ -513,6 +515,7 @@ class GridView(QListView):
         else:
             self.ignore_render_requests.set()
 
+    if delay_render:
         def wheelEvent(self, e):
             self.ignore_render_requests.set()
             QListView.wheelEvent(self, e)

src/calibre/gui2/library/caches.py

@@ -24,7 +24,7 @@ class CoverCache(dict):
 
     ' This is a RAM cache to speed up rendering of covers by storing them as QPixmaps '
 
-    def __init__(self, limit=200):
+    def __init__(self, limit=100):
         self.items = OrderedDict()
         self.lock = Lock()
         self.limit = limit