diff --git a/Makefile b/Makefile
index 3ed41c6..2becaa4 100644
--- a/Makefile
+++ b/Makefile
@@ -29,15 +29,15 @@ r_build:
 	docker build --no-cache --force-rm --pull -t forecast-eval-build docker_build
 
 # Download the named file from the AWS S3 bucket
-%.rds: dist
+%.csv.gz: dist
 	test -f dist/$@ || curl -o dist/$@ $(S3_URL)/$@
 
 # Specify all the data files we want to download
-pull_data: score_cards_state_deaths.rds score_cards_state_cases.rds score_cards_nation_cases.rds score_cards_nation_deaths.rds score_cards_state_hospitalizations.rds score_cards_nation_hospitalizations.rds datetime_created_utc.rds
+pull_data: score_cards_state_deaths.csv.gz score_cards_state_cases.csv.gz score_cards_nation_cases.csv.gz score_cards_nation_deaths.csv.gz score_cards_state_hospitalizations.csv.gz score_cards_nation_hospitalizations.csv.gz datetime_created_utc.csv.gz
 
 # Download all the predictions cards objects. This is
 # useful for development and debugging
-pull_pred_cards: predictions_cards_confirmed_admissions_covid_1d.rds predictions_cards_confirmed_incidence_num.rds predictions_cards_deaths_incidence_num.rds
+pull_pred_cards: predictions_cards_confirmed_admissions_covid_1d.csv.gz predictions_cards_confirmed_incidence_num.csv.gz predictions_cards_deaths_incidence_num.csv.gz
 
 # Create the dist directory
 dist:
@@ -59,7 +59,7 @@ score_forecast: r_build dist pull_data
 
 # Post scoring pipeline output files to the AWS S3 bucket
 deploy: score_forecast
-	aws s3 cp dist/ $(S3_BUCKET)/ --recursive --exclude "*" --include "*rds" --acl public-read
+	aws s3 cp dist/ $(S3_BUCKET)/ --recursive --exclude "*" --include "*csv.gz" --acl public-read
 
 # Run bash in a docker container with a full preconfigured R environment
 #
diff --git a/Report/create_reports.R b/Report/create_reports.R
index 6ccbb0c..cb168d3 100644
--- a/Report/create_reports.R
+++ b/Report/create_reports.R
@@ -4,6 +4,7 @@ library("dplyr")
 library("evalcast")
 library("lubridate")
 library("stringr")
+library("data.table")
 
 # TODO: Contains fixed versions of WIS component metrics, to be ported over to evalcast
 # Redefines overprediction, underprediction and sharpness
@@ -23,7 +24,8 @@ option_list <- list(
 opt_parser <- OptionParser(option_list = option_list)
 opt <- parse_args(opt_parser)
 output_dir <- opt$dir
-prediction_cards_filename <- "predictions_cards_${signal}.rds"
+# Compress since prediction cards obj is big
+prediction_cards_filename <- "predictions_cards_${signal}.csv.gz"
 prediction_cards_filepath <- case_when(
   !is.null(output_dir) ~ file.path(output_dir, prediction_cards_filename),
   TRUE ~ prediction_cards_filename
@@ -106,17 +108,15 @@ class(predictions_cards) <- c("predictions_cards", class(predictions_cards))
 print("Saving predictions...")
 if (length(signals) == 1) {
   signal <- signals
-  saveRDS(predictions_cards,
-    file = str_interp(prediction_cards_filepath),
-    compress = "xz"
+  fwrite(predictions_cards,
+    file = str_interp(prediction_cards_filepath)
   )
 } else {
   # Save each signal separately.
   for (signal_group in group_split(predictions_cards, signal)) {
     signal <- signal_group$signal[1]
-    saveRDS(signal_group,
+    fwrite(signal_group,
       file = str_interp(prediction_cards_filepath),
-      compress = "xz"
     )
   }
 }
@@ -228,5 +228,5 @@ if (length(save_score_errors) > 0) {
   stop(paste(save_score_errors, collapse = "\n"))
 }
 
-saveRDS(data.frame(datetime = c(data_pull_timestamp)), file = file.path(output_dir, "datetime_created_utc.rds"))
+fwrite(data.frame(datetime = c(data_pull_timestamp)), file = file.path(output_dir, "datetime_created_utc.csv.gz"))
 print("Done")
diff --git a/Report/score.R b/Report/score.R
index 364677a..2a98eb7 100644
--- a/Report/score.R
+++ b/Report/score.R
@@ -13,7 +13,7 @@ generate_score_card_file_path <- function(geo_type, signal_name, output_dir) {
     output_dir,
     paste0(
       "score_cards_", geo_type, "_",
-      sig_suffix, ".rds"
+      sig_suffix, ".csv.gz"
     )
   )
   return(output_file_name)
@@ -44,10 +44,7 @@ save_score_cards <- function(score_card, geo_type = c("state", "nation"),
   }
 
   output_file_name <- generate_score_card_file_path(geo_type, signal_name, output_dir)
-  saveRDS(score_card,
-    file = output_file_name,
-    compress = "xz"
-  )
+  fwrite(score_card, file = output_file_name)
 }
 
 save_score_cards_wrapper <- function(score_card, geo_type, signal_name, output_dir) {
diff --git a/Report/utils.R b/Report/utils.R
index 311bb38..ed09705 100644
--- a/Report/utils.R
+++ b/Report/utils.R
@@ -1,6 +1,6 @@
 check_for_missing_forecasters <- function(predictions_cards, forecasters_list, geo_type, signal_name, output_dir) {
   output_file_name <- generate_score_card_file_path(geo_type, signal_name, output_dir)
-  previous_run_forecasters <- readRDS(output_file_name) %>%
+  previous_run_forecasters <- fread(output_file_name, data.table = FALSE) %>%
     filter(signal == signal_name) %>%
     distinct(forecaster) %>%
     pull()
diff --git a/app/R/data.R b/app/R/data.R
index 1079939..ed78bbe 100644
--- a/app/R/data.R
+++ b/app/R/data.R
@@ -1,4 +1,5 @@
 library(aws.s3)
+library(data.table)
 
 # Set application-level caching location. Stores up to 1GB of caches. Removes
 # least recently used objects first.
@@ -33,16 +34,25 @@ getData <- function(filename, s3bucket) {
   if (!is.null(s3bucket)) {
     tryCatch(
       {
-        aws.s3::s3readRDS(object = filename, bucket = s3bucket)
+        result <- s3read_using(fread, data.table = FALSE, object = filename, bucket = s3bucket)
       },
       error = function(e) {
         e
-        getFallbackData(filename)
+        result <- getFallbackData(filename)
       }
     )
   } else {
-    getFallbackData(filename)
+    result <- getFallbackData(filename)
   }
+
+  if (filename != "datetime_created_utc.csv.gz") {
+    # fread uses the `IDate` class for dates. This causes problems downstream,
+    #  so cast to base `Date`.
+    result$target_end_date <- as.Date(result$target_end_date)
+    result$forecast_date <- as.Date(result$forecast_date)
+  }
+
+  return(result)
 }
 
 createS3DataFactory <- function(s3bucket) {
@@ -57,12 +67,12 @@ getFallbackData <- function(filename) {
     filename,
     file.path("../dist/", filename)
   )
-  readRDS(path)
+  fread(path, data.table = FALSE)
 }
 
 
 getCreationDate <- function(loadFile) {
-  dataCreationDate <- loadFile("datetime_created_utc.rds")
+  dataCreationDate <- loadFile("datetime_created_utc.csv.gz")
   return(dataCreationDate %>% pull(datetime) %>% as.Date())
 }
 
@@ -70,16 +80,16 @@ getCreationDate <- function(loadFile) {
 getAllData <- function(loadFile, targetVariable) {
   df <- switch(targetVariable,
     "Deaths" = bind_rows(
-      loadFile("score_cards_state_deaths.rds"),
-      loadFile("score_cards_nation_deaths.rds")
+      loadFile("score_cards_state_deaths.csv.gz"),
+      loadFile("score_cards_nation_deaths.csv.gz")
     ),
     "Cases" = bind_rows(
-      loadFile("score_cards_state_cases.rds"),
-      loadFile("score_cards_nation_cases.rds")
+      loadFile("score_cards_state_cases.csv.gz"),
+      loadFile("score_cards_nation_cases.csv.gz")
     ),
     "Hospitalizations" = bind_rows(
-      loadFile("score_cards_state_hospitalizations.rds"),
-      loadFile("score_cards_nation_hospitalizations.rds")
+      loadFile("score_cards_state_hospitalizations.csv.gz"),
+      loadFile("score_cards_nation_hospitalizations.csv.gz")
     )
   )
 
diff --git a/app/assets/about.md b/app/assets/about.md
index 53f3766..aeac897 100644
--- a/app/assets/about.md
+++ b/app/assets/about.md
@@ -91,21 +91,25 @@ The forecasts and scores are available as RDS files and are uploaded weekly to a
 You can use the url https://forecast-eval.s3.us-east-2.amazonaws.com/ + filename to download
 any of the files from the bucket.
 
-For instance: https://forecast-eval.s3.us-east-2.amazonaws.com/score_cards_nation_cases.rds to download scores for nation level case predictions.
+For instance: https://forecast-eval.s3.us-east-2.amazonaws.com/score_cards_nation_cases.csv.gz to download scores for nation level case predictions.
 
 The available files are:
-* predictions_cards.rds (forecasts)
-* score_cards_nation_cases.rds
-* score_cards_nation_deaths.rds
-* score_cards_state_cases.rds
-* score_cards_state_deaths.rds
-* score_cards_state_hospitalizations.rds
-* score_cards_nation_hospitalizations.rds
+* predictions_cards_confirmed_incidence_num.csv.gz (forecasts for cases)
+* predictions_cards_deaths_incidence_num.csv.gz (forecasts for deaths)
+* predictions_cards_confirmed_admissions_covid_1d.csv.gz (forecasts for hospitalizations)
+* score_cards_nation_cases.csv.gz
+* score_cards_nation_deaths.csv.gz
+* score_cards_state_cases.csv.gz
+* score_cards_state_deaths.csv.gz
+* score_cards_state_hospitalizations.csv.gz
+* score_cards_nation_hospitalizations.csv.gz
 
 You can also connect to AWS and retrieve the data in R. Example of retrieving state cases file:
 
 ```
 library(aws.s3)
+library(data.table)
+
 Sys.setenv("AWS_DEFAULT_REGION" = "us-east-2")
 s3bucket = tryCatch(
   {
@@ -118,14 +122,20 @@ s3bucket = tryCatch(
 
 stateCases = tryCatch(
   {
-    s3readRDS(object = "score_cards_state_cases.rds", bucket = s3bucket)
+    s3read_using(fread, object = "score_cards_state_cases.csv.gz", bucket = s3bucket)
   },
   error = function(e) {
     e
   }
 )
 ```
-  
+
+or using the URL of the file:
+
+```
+library(data.table)
+stateCases <- fread("https://forecast-eval.s3.us-east-2.amazonaws.com/score_cards_state_cases.csv.gz")
+```
   
 
 ##### Forecasts with actuals
diff --git a/app/assets/forecastsWithActuals.R b/app/assets/forecastsWithActuals.R
index 3fb84ce..a9389c5 100644
--- a/app/assets/forecastsWithActuals.R
+++ b/app/assets/forecastsWithActuals.R
@@ -1,11 +1,12 @@
 library(dplyr)
 library(tidyr)
 library(aws.s3)
+library(data.table)
 
 Sys.setenv("AWS_DEFAULT_REGION" = "us-east-2")
 s3bucket <- tryCatch(
   {
-    get_bucket(bucket = "forecast-eval")
+    aws.s3::get_bucket(bucket = "forecast-eval")
   },
   error = function(e) {
     e
@@ -15,7 +16,7 @@ s3bucket <- tryCatch(
 readbucket <- function(name) {
   tryCatch(
     {
-      s3readRDS(object = name, bucket = s3bucket)
+      s3read_using(fread, data.table = FALSE, object = name, bucket = s3bucket)
     },
     error = function(e) {
       e
@@ -25,24 +26,21 @@ readbucket <- function(name) {
 
 # Cases, deaths, hosp scores: needed for "actual"s
 cases <- bind_rows(
-  readbucket("score_cards_nation_cases.rds"),
-  readbucket("score_cards_state_cases.rds")
+  readbucket("score_cards_nation_cases.csv.gz"),
+  readbucket("score_cards_state_cases.csv.gz")
 )
 deaths <- bind_rows(
-  readbucket("score_cards_nation_deaths.rds"),
-  readbucket("score_cards_state_deaths.rds")
+  readbucket("score_cards_nation_deaths.csv.gz"),
+  readbucket("score_cards_state_deaths.csv.gz")
 )
 hosp <- bind_rows(
-  readbucket("score_cards_nation_hospitalizations.rds"),
-  readbucket("score_cards_state_hospitalizations.rds")
+  readbucket("score_cards_nation_hospitalizations.csv.gz"),
+  readbucket("score_cards_state_hospitalizations.csv.gz")
 )
 
-# The big one: predictions from all forecasters
-pred <- readbucket("predictions_cards.rds")
-
 # Cases
+pred <- readbucket("predictions_cards_confirmed_incidence_num.csv.gz")
 pred_cases <- pred %>%
-  filter(signal == "confirmed_incidence_num") %>%
   mutate(signal = NULL, data_source = NULL, incidence_period = NULL) %>%
   pivot_wider(
     names_from = quantile,
@@ -50,6 +48,9 @@ pred_cases <- pred %>%
     names_prefix = "forecast_"
   )
 
+rm(pred)
+gc()
+
 actual_cases <- cases %>%
   select(ahead, geo_value, forecaster, forecast_date, target_end_date, actual)
 
@@ -58,8 +59,8 @@ sum(is.na(actual_cases$actual)) == sum(is.na(joined_cases$actual))
 write.csv(joined_cases, "cases.csv")
 
 # Deaths
+pred <- readbucket("predictions_cards_deaths_incidence_num.csv.gz")
 pred_deaths <- pred %>%
-  filter(signal == "deaths_incidence_num") %>%
   mutate(signal = NULL, data_source = NULL, incidence_period = NULL) %>%
   pivot_wider(
     names_from = quantile,
@@ -67,6 +68,9 @@ pred_deaths <- pred %>%
     names_prefix = "forecast_"
   )
 
+rm(pred)
+gc()
+
 actual_deaths <- deaths %>%
   select(ahead, geo_value, forecaster, forecast_date, target_end_date, actual)
 
@@ -75,12 +79,13 @@ sum(is.na(actual_deaths$actual)) == sum(is.na(joined_deaths$actual))
 write.csv(joined_deaths, "deaths.csv")
 
 # Hospitalizations: break up by weeks since we run into memory errors o/w!
+pred <- readbucket("predictions_cards_confirmed_admissions_covid_1d.csv.gz")
 pred_hosp <- actual_hosp <- joined_hosp <- vector(mode = "list", length = 4)
 for (k in 1:4) {
   cat(k, "... ")
   days <- (k - 1) * 7 + 1:7
   pred_hosp[[k]] <- pred %>%
-    filter(signal == "confirmed_admissions_covid_1d", ahead %in% days) %>%
+    filter(ahead %in% days) %>%
     mutate(signal = NULL, data_source = NULL, incidence_period = NULL) %>%
     pivot_wider(
       names_from = quantile,
diff --git a/app/server.R b/app/server.R
index 1d7b067..53a8328 100644
--- a/app/server.R
+++ b/app/server.R
@@ -402,6 +402,7 @@ server <- function(input, output, session) {
     # Fill gaps so there are line breaks on weeks without data
     # This is failing for CU-select on US deaths (https://github.com/cmu-delphi/forecast-eval/issues/157)
     filteredScoreDf <- filteredScoreDf %>%
+      mutate(Week_End_Date = as.Date(Week_End_Date)) %>%
       as_tsibble(key = c(Forecaster, ahead), index = Week_End_Date) %>%
       group_by(Forecaster, Forecast_Date, ahead) %>%
       fill_gaps(.full = TRUE)
diff --git a/devops/Dockerfile b/devops/Dockerfile
index d64a6fa..9bcc4e6 100644
--- a/devops/Dockerfile
+++ b/devops/Dockerfile
@@ -9,7 +9,7 @@ RUN apt-get update && apt-get install -qq -y \
 COPY devops/shiny_server.conf /etc/shiny-server/shiny-server.conf
 WORKDIR /srv/shinyapp/
 COPY DESCRIPTION ./
-RUN Rscript -e "devtools::install_deps(dependencies = NA)"
-COPY dist/*.rds ./
+RUN Rscript -e "devtools::install_deps(dependencies = NA); install.packages('R.utils')"
+COPY dist/*.csv.gz ./
 COPY app/ ./
 RUN chmod -R a+rw .