FXBlurView Background Lagging

Question

I'm using FXBlurView for my background blurs on my UIViews. I'm using the default settings, which means that it updates every frame. However, for some reason, the background seems to lag a bit. Here is a GIF of the issue I'm having:
BlurGIF http://www.interdazzle.com/misc/forums/BlurGIF.gif If anyone could help, that would be wonderful. Thanks in advance!

Edit: I changed my code a bit to match what Nick suggested, and came up with this: When it is initialized:

   self.sidebar.blurRadius = 30;
    self.sidebar.dynamic = NO;
    self.sidebar.contentMode = UIViewContentModeLeft;
    [self.sidebar updateAsynchronously:YES completion:^{
        self.sidebar.frame = CGRectMake(0, 0, 250, [[UIScreen mainScreen] bounds].size.height);

    }];

When I animate it:

[UIView animateWithDuration:0.5 animations:^{
    BOOL open = self.sidebar.frame.size.width >= 250;
    self.sidebar.frame = CGRectMake(open? -250: 0, self.sidebar.frame.origin.y, open? 0: 250, self.sidebar.frame.size.height);
}];

However, it doesn't seem to update/position correctly. Thank you in advance!

Answer 1

Expanding on @NickLockwood's question:
When the FXBlurView is initiated, I run this code:

self.sidebar.blurRadius = 30;
self.sidebar.dynamic = NO;
self.sidebar.contentMode = UIViewContentModeRight;
self.sidebar.layer.contentsGravity = kCAGravityBottomLeft;
[self.sidebar setClipsToBounds:YES];
[self.sidebar updateAsynchronously:YES completion:^{
    // Whatever you want
}];

Then I simply animate the object like this:

[UIView animateWithDuration:0.5 animations:^{
        BOOL open = self.sidebar.frame.size.width > 125; // Over half way done
        self.sidebar.frame = CGRectMake(0,0, open? 0 : 250, [[UIScreen mainScreen] bounds].size.height);
    }];

Thanks!