Okay, the event sheet's a little of a mess but hopefully you can see where stuff goes where: dropbox.com/s/vf1mzigf3y4r38a/SpearDeer.capx
Arrow keys to move around
Hold Q for a bit to fire the spear (currently only facing right and isn't mirrored even when the player is facing left)
The fired spear is different from the one pinned to the player sprite. Currently it spawns a duplicate physics-Spear.
For me, I'm using Chrome to preview. Sometimes I refresh the browser itself, other times I go back to Construct and launch another preview.
The lag only seems to affect the speed of the path of the Spear, the only physics object. Other things like the animated Deer, don't seem affected.
Edit: Just updated the file. More physics objects that are pinned to the Deer to make the spear hits register. Doesn't change frequency of preview lag (in fact feels less than before, funnily enough).
PS: Why does the forum session frequently 'expire' before 1min and I have to copy and paste my new post and post after refreshing the page within 5 seconds :S?