diff --git a/src/image.zig b/src/image.zig
index 17a545d..28ca2ba 100644
--- a/src/image.zig
+++ b/src/image.zig
@@ -5,11 +5,11 @@ const custom = @import("custom.zig");
 
 const plugins = @import("plugin.zig");
 
-/// Approximate size of the BMP header.
+/// Approximate size of the BMP header, in bytes.
 pub const BMPHeaderSize: usize = 82000;
 
-/// Buffer size for main copying
-pub const BufferSize: usize = 60000;
+/// Buffer size for main image copying.
+pub const BufferSize: usize = 300000;
 
 pub const ImageError = error{
     OpenFail,
@@ -176,6 +176,7 @@ pub const Image = struct {
         return n_read == 1;
     }
 
+    /// Copy bytes from the current file to out_file.
     fn copyBytes(
         self: *Image,
         out_file: *c.SNDFILE,
diff --git a/src/plugin.zig b/src/plugin.zig
index 4612523..c403eb7 100644
--- a/src/plugin.zig
+++ b/src/plugin.zig
@@ -95,6 +95,8 @@ pub const RunContext = struct {
         plugin: *const c.LilvPlugin,
     ) !RunContext {
         var instance = c.lilv_plugin_instantiate(plugin, f64(44100), null);
+        errdefer c.lilv_instance_free(instance);
+
         if (instance == null) {
             return ImageError.InstantiateFail;
         }
@@ -139,13 +141,17 @@ pub const RunContext = struct {
 
 pub fn makeContext(allocator: *std.mem.Allocator, plugin_uri: []const u8) !Context {
     const cstr_plugin_uri = try std.cstr.addNullByte(allocator, plugin_uri);
-    var world = c.lilv_world_new().?;
+
+    var world: *c.LilvWorld = c.lilv_world_new().?;
+    errdefer c.lilv_world_free(world);
 
     c.lilv_world_load_all(world);
+
     var uri: *c.LilvNode = c.lilv_new_uri(world, cstr_plugin_uri.ptr) orelse blk: {
         std.debug.warn("Invalid plugin URI <{}>\n", plugin_uri);
         return ImageError.InvalidPlugin;
     };
+    defer c.lilv_node_free(uri);
 
     const plugins: *const c.LilvPlugins = c.lilv_world_get_all_plugins(world);
 
@@ -154,7 +160,9 @@ pub fn makeContext(allocator: *std.mem.Allocator, plugin_uri: []const u8) !Conte
         return ImageError.UnknownPlugin;
     };
 
-    c.lilv_node_free(uri);
-
-    return Context{ .allocator = allocator, .world = world, .plugin = plugin };
+    return Context{
+        .allocator = allocator,
+        .world = world,
+        .plugin = plugin,
+    };
 }