Performance issue with 1.13.1-mc1.10.2 with RF Stargate Power Unit

[billm]

When placed and powered under the stargate, the RF Stargate Power Unit drops my FPS from a rate limited 60fps to under 30. The F3 screen shows upwards of 20 chunk updates a second. As soon as the power unit block is broken, performance comes back. Replication is easy:

• Create stargate
• Place RF Stargate Power Unit underneath
• Place creative power cell (from EnderIO in my testing) next to power unit
• As soon as the power unit starts to receive power, FPS tanks and chunk updates climb

SGCraft 1.13.1
Minecraft 1.10.2
Forge 12.18.2.2171

Best guess on the issue is the calls to markDirty()/markBlockForUpdate() in RFPowerTE.addEnergy() - I could see where 20 chunk updates a second are coming from if one of those methods is saving the chunk each tick.