This is a dedicated post for the available addons. You can find the grass, leaves and 4096x download links here. These are all in a "resurce pack format" so no need for forge. You can use them as standalone or with other resource packs. All you have to do is simply load these on top of the main pack like shown on the screenshot below.
Obviously the 4096x and the grass addon is really hard to run so keep that in mind. I only made these to push the limits and see what can be achived with these mods. :D
As for the Leaves addon, this was the one that made to increase the fps. So if you're having issues running the main packs you can try these leaves. These leaves are using the vanilla models, so the leaves will be blocky. I actually prefer these over the custom 3d ones.
Downloads

兰檬 刘
2023-12-28 17:50:15 +0000 UTChodiltoN
2023-03-19 08:17:42 +0000 UTC磊王
2023-03-18 12:42:40 +0000 UTCdiego
2023-01-18 04:29:29 +0000 UTC人 好
2022-08-31 05:19:42 +0000 UTC人 好
2022-08-31 05:19:07 +0000 UTChodiltoN
2022-08-06 22:57:55 +0000 UTCGamer Group
2022-08-06 17:40:27 +0000 UTCFelix's Artist Rex
2022-03-02 00:55:00 +0000 UTCFelix's Artist Rex
2022-03-02 00:51:20 +0000 UTCSatariation
2022-01-24 07:16:04 +0000 UTCDavis Johnstone
2022-01-23 20:51:21 +0000 UTCDavid Cho
2022-01-16 18:37:49 +0000 UTCDovahkiin
2021-12-29 20:53:17 +0000 UTCDovahkiin
2021-12-29 20:52:55 +0000 UTCDovahkiin
2021-12-29 20:52:15 +0000 UTCCharles
2021-12-02 16:14:34 +0000 UTCCharles
2021-12-02 16:13:37 +0000 UTChodiltoN
2021-11-30 10:07:53 +0000 UTChodiltoN
2021-11-22 11:23:15 +0000 UTChodiltoN
2021-11-12 03:16:58 +0000 UTCSnorable
2021-11-12 02:19:37 +0000 UTChodiltoN
2021-11-05 15:31:23 +0000 UTCender cool
2021-11-05 13:37:25 +0000 UTCender cool
2021-11-04 13:36:41 +0000 UTCender cool
2021-11-04 13:36:14 +0000 UTChodiltoN
2021-11-04 13:02:05 +0000 UTCMichele Franceschini
2021-11-04 11:21:29 +0000 UTChodiltoN
2021-10-21 05:45:37 +0000 UTChodiltoN
2021-10-21 05:41:13 +0000 UTChodiltoN
2021-10-20 23:20:40 +0000 UTC