Minecraft block lag 1.9

Oddly, Mojang doesn't have any minimum or recommended specs on minecraft.net, instead burying it in a crowd-sourced help article about system requirements.

You appear to have more than the minimum required specs:

Minimum Requirements:
CPU : Intel P4 or its AMD Equivalent (AMD K7)
RAM : 2GB
GPU : Intel GMA 950 or AMD Equivalent with OpenGL 2.1 Support
HDD : At least 100MB for Game Core and Sound Files

… but your system falls far short of the recommended specs due to not having a discrete graphics card:

Recommended Requirements:
CPU : Intel Pentium D or AMD Athlon 64 (K8) 2.6 GHz
RAM : 4GB
GPU : GeForce 6xxx or ATI Radeon 9xxx and up with OpenGL 2.1 Support (Excluding Integrated Chipsets)
HDD : 150MB

I've had this happen to me before, it's because your computer is still rendering blocks in the distance. Try reducing your graphics settings to Fast instead of Fancy and reducing the Render Distance in Minecraft's video settings.