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Game stops for a second every few seconds starting in Selima level.
Its hard to play cos of this- unplayable.

Any fix?
According to the comments on a Youtube video, this is caused by building over the spawn grounds for the ostriches. Apparently this was a bug in the original game too. I haven't reached the mission yet, so I don't know for sure.

Video that mentions this bug. (I can't post links yet)
Search Youtube for "Pharaoh A New Era Game-Killing Bug makes it Unplayable"

The solution is in the comments.