FPS grumbles.. And nice church!

Unity 5

Well the church is certainly getting somewhere now, nice lights, moonlight shining onto the floor, (I love using spotlight cookies)
a few flickering candles (hand made particles?… and pretty ok light map..
but WHAT THIS?? 4.9 FRAMES PER SECOND.. DAMN IT!!!
Unity Geeks… Please come with suggestions?
Lower textures res?
Theres about 1000 trees that you cant see outside… Is that a problem?
Is the church too heavy at 8600 tris? (built in quads of course!)
Theres some serious snowing going on outside, so more particles?
Or.. is it all the terrain?
Or simply time for a new computer?

Time to test…